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Verdict: A tight, atmospheric undercover-FBI-meets-mafia-heiress romance that does the cat-and-mouse setup very well and asks you to buy a second book for the happy ending — which the listing does not tell you.
Best for: Readers who want forbidden, high-tension sapphic mafia romance in a fast 226 pages, and who are content to read a duet as a duet.
Heat level: ★★★★☆ (4/5 — romance.io bands it “Explicit open door”; I Heart SapphFic bands it “Hot & Steamy”; one three-star reviewer awards her three stars partly for the sex scenes)
Rating: ★★★★☆ (4.0/5 — a 4.29 Goodreads average across 806 ratings, marked down because the resolution is withheld for book two and two readers find the undercover agent implausibly incompetent)
Tropes: Mafia, undercover agent, enemies to lovers, cat and mouse, forbidden love, criminal heiress, private members’ club, deception, class difference, duet with the HEA in book two.
What Is An Exclusive Game About?
An Exclusive Game is book one of the Ruby Realm Duet, published on 11 October 2023 at 226 pages, and it belongs to a large and deliberately structured body of work: Persephone Black writes sapphic mafia romance in two-book units, and readers who like one duet tend to read all of them. One Goodreads reviewer notes she is six books deep and that the model works — with the caveat, in her own words, that the story carries some weight on whether a reader picks up the second book.
Natalie is a federal agent assigned to bring down Alessa de Luca, a mafia heiress who runs an exclusive private members’ club with a gambling operation underneath it. Natalie goes in undercover as an heiress. Alessa is charming, dangerous and, it turns out, extremely interested. The closer the operation gets to a result, the less Natalie can tell whether she is running the deception or inside it.
It has done well. Goodreads has it at 4.29 across 806 ratings with 57 written reviews; Amazon at 4.6 across 607, with a histogram of 71 percent five stars, 23 percent four, 6 percent three and nothing at all below that; romance.io at 4.31 across 13. Its strongest Amazon ranking is #49 in LGBTQ+ Mystery, which is the right shelf — this is a suspense novel that happens to be a romance.
It is on Kindle Unlimited, verified on the Amazon listing on 20 August 2026.
What Makes This Sapphic Mafia Romance Work
Atmosphere, first. Even the reviewer most critical of this book grants that Black builds a suspenseful, tense atmosphere and that the plot is clean and easy to follow with some genuine small twists. The club is the reason: a single glamorous, closed setting where every conversation is a performance and everyone has a second purpose. It does a great deal of work cheaply.
Alessa is the second reason, and she is the character readers actually come back for. Reviewers describe her as magnetic, as having her persona entirely under control, as a businesswoman with a heart of gold and a streak of the dominatrix. Even readers who did not much enjoy the book say she is interesting. That is the mark of a lead who has been thought about.
Third, it is short and it moves. At 226 pages this is a book you finish in an evening, and the reviews reflect that — “captivating”, “rollercoaster”, “addictive” recur. There is no sag, because there is no room for one.
Book Synopsis
Alessa de Luca always gets what she wants, and what she currently wants is the elegant new member of her club. That member is Natalie, a federal agent working undercover to dismantle the illicit empire Alessa runs beneath a legitimate one. The assignment requires proximity. The proximity produces something neither of them planned for.
As Natalie’s team closes in, the deception she is running starts to cost more than she budgeted for, and the line between playing a part and meaning it stops being visible. When the lies begin to collapse, she has to choose between the job she swore to do and the woman she was sent to destroy.
My Review
The thing you most need to know about this book is not in the blurb: it does not end. Not in the sense of a cliffhanger anyone in our sample complained about, but in the structural sense — a Goodreads reviewer states plainly that this is the first of two books and the resolution, the happy ending, comes in the second. The Amazon listing calls it “Ruby Realm Duet Book 1” and stops there. If you read book one expecting a complete romance, you will not get one. Book two, A Dangerous Prize, is published, is also on Kindle Unlimited, and rates higher than this one. Plan to read both.
With that settled, this is a good book doing a specific job well. The undercover premise is one of the most reliable engines in romance because it makes intimacy and betrayal the same act, and Black knows it. The tension is real, the club is a genuinely well-chosen setting, and the pacing never slackens.
Where it strains is Natalie. Two independent reviewers make the same objection from different angles: one calls the detective in this book so incompetent it is an achievement; the other dislikes the trope of someone supposedly excellent at her job becoming a complete idiot the moment she is attracted to someone, and says that is what happens to both leads. In a novel whose entire tension depends on the reader believing the operation is real, an agent who stops behaving like an agent costs you something. It is not a majority view — five three-star reviews and one two-star out of thirty — but it is the specific complaint that recurs.
The related charge is flatness. One three-star reviewer who liked the premise and the atmosphere says the characters were dull, and that the romance went dull with them. Set against a dozen five-star readers calling the chemistry electric, that reads as a book with a wide response range rather than a broken one — but it is the same divide you see in a lot of short, plot-forward romance: readers who want the situation are satisfied, readers who want the people are not always.
How Spicy Is An Exclusive Game?
Four out of five, and the sources line up. romance.io bands the steam at 4/5, “Explicit open door”. I Heart SapphFic bands it “Hot & Steamy” — its definition is full graphic description of sexual acts, possibly with crude language. The publisher’s own description calls it a steamy F/F mafia romance with some dark elements and a lot of angst. And one three-star reviewer, who was not otherwise impressed, says two of her three stars are for the sex scenes and for Alessa.
That last detail is the useful one. When a lukewarm reader singles out the heat as a reason to round up, the heat is doing real work. This is explicit, on the page, and a substantial part of what readers are here for.
Who Should Read This Book?
Read it if the undercover-and-compromised premise is your thing, and you want it played as suspense rather than as farce. Read it if you like a closed, glamorous setting and a lead who is genuinely dangerous rather than dangerous-adjacent. Read it if you want a mafia romance that is explicit but, per I Heart SapphFic, keeps its violence non-graphic. And read it if you are happy to commit to two books, because that is the unit of purchase here.
Approach with care if you need a complete arc in one volume. Approach with care if procedural plausibility matters to you — the agent’s tradecraft is the thing two readers could not get past. And approach with care if “dark elements” is a phrase that concerns you, because the publisher uses it and the page you found this book on previously said the opposite.
On content specifically: the publisher does enumerate content notes — on the copyright page, inside the book, where no one can see them before buying. What we can tell you from outside is that I Heart SapphFic reports murder and violence in line with mafia romance but not graphic, and that a romance.io reader has tagged the book for human trafficking. Those two statements are not in conflict, but the second is the sort of thing a shopper deserves to know in advance. We have not verified it against the book’s own notes.
What Readers Are Actually Saying (August 2026)
Our thirty-review Goodreads sample splits twelve five-star, eleven four-star, five three-star, one two-star and one unrated — a flatter, more four-star-heavy shape than most books in this cluster, which is what a well-executed genre exercise tends to look like. Amazon is warmer still: 71 percent five stars and nothing below three.
The praise is for tension, atmosphere and Alessa, in roughly that order, and for the reading experience — readers describe finishing it fast and immediately wanting the next one. Persephone Black has a following that treats the duets as a set, and several reviews are really about the whole Sapphic Mafia body of work rather than this instalment.
The criticism is narrow and concentrated: the agent’s competence, and characters some readers found flat. One reviewer’s entire verdict is that this could have been exceptional, which is its own kind of compliment. Nobody in our sample calls the book badly written, and nobody complains about the editing — unusual in this catalogue.
Discovery here is running through the author’s backlist and through audio rather than through press. We found no trade reviews and no blog coverage. What we did find is a Libro.fm bookseller recommendation for the whole Sapphic Mafia Universe, which is a real independent endorsement from a bookseller rather than a reader — and worth noting that the same text also appears as a Goodreads review, so do not count it twice.
Prefer audio? Listen to An Exclusive Game on Libro.fm — the audiobook shop that supports independent bookstores. It is narrated by Avery Reid and Quinn Riley, published by Tantor Media, and runs six hours and fifteen minutes. Book two is on Libro.fm too, which matters given that the story finishes there.
Frequently Asked Questions
Does An Exclusive Game end on a cliffhanger?
It ends without the happy ending. A Goodreads reviewer states directly that this is the first of a two-book series and the HEA arrives in the second. Nobody in our sample describes a shock cut mid-scene, so “unresolved” is fairer than “cliffhanger” — but the romance does not conclude here. Book two, A Dangerous Prize, is out and also on Kindle Unlimited.
How explicit is it?
Explicit. romance.io bands the steam 4/5, “Explicit open door”; I Heart SapphFic bands it “Hot & Steamy”; the publisher’s own copy calls it steamy. One three-star reviewer credits the sex scenes for part of her rating.
Is it dark?
Somewhat — and more than the listing lets on. The publisher’s description says “some dark elements and a lot of angst”. I Heart SapphFic reports murder and violence consistent with mafia romance but not graphic. A romance.io reader has tagged the book for human trafficking. This is not extreme dark romance, but it is not a clean caper either.
Are there content warnings?
The publisher says content notes are on the copyright page — that is, inside the book, invisible to anyone browsing. Nothing is enumerated on the Amazon listing. The external flags we could find are murder and violence, described as non-graphic, and one reader tag for human trafficking.
Is there an audiobook?
Yes — narrated by Avery Reid and Quinn Riley, published by Tantor Media, six hours fifteen minutes, and available on Libro.fm.
Is it on Kindle Unlimited?
Yes — verified on the Amazon listing on 20 August 2026, and so is book two, which you will want. Kindle Unlimited availability is the publisher’s to change, so check the listing before you plan around it.
If You Loved An Exclusive Game, Read These Next
The next book you need is the other half of this one: A Dangerous Prize, which finishes Alessa and Natalie’s story and rates higher than this instalment. After that, The Ties That Bind Us is the darker sapphic mafia option if you want the violence on the page rather than off it. More in our mafia Kindle Unlimited list and across all our book reviews.
The Bottom Line
An Exclusive Game is a well-made piece of genre engineering. The premise is strong, the club is a superb setting, Alessa is the kind of antagonist-love-interest the subgenre exists to produce, and at 226 pages it does not waste a chapter. It is also half a story sold as a book, and its federal agent behaves in ways two readers found impossible to credit. Neither of those is fatal — 806 Goodreads ratings averaging 4.29 and an Amazon histogram with nothing below three stars say most readers had a very good time — but both are worth knowing before you start. Pick it up on Kindle Unlimited if you are willing to read the duet as one book. If you want a self-contained mafia romance, start elsewhere.
The Eikna Overall Ranking
On the Eikna scale, An Exclusive Game ranks as a tense, explicit, cleanly plotted sapphic mafia romance with an excellent central setting and a magnetic criminal lead — held back by an undercover agent two readers found implausible, characterisation some found thin, and a resolution deferred to a second book the listing does not warn you about.
The Evidence Scorecard
Overall ★★★★☆ 4.0/5
- ✓ 4.29 average across 806 Goodreads ratings
- ✓ 4.6 on Amazon across 607 ratings, nothing below three stars
- ✓ #49 in LGBTQ+ Mystery on Amazon
- ✓ The romance does not resolve until book two
Romance ★★★★☆ 4.1/5
- ✓ Undercover premise makes intimacy and betrayal the same act
- ✓ Readers repeatedly describe the chemistry as electric
- ✓ Forbidden dynamic sustained without artificial obstacles
- ✓ One three-star reader found the romance dull
Characters ★★★★☆ 3.6/5
- ✓ Alessa is praised even by unimpressed readers
- ✓ Her control of her own persona is the book’s best idea
- ✓ Two reviewers find the federal agent implausibly incompetent
- ✓ One reviewer calls both leads flat
Writing ★★★★☆ 4.0/5
- ✓ Suspenseful, tense atmosphere granted even by critics
- ✓ Plot is clean and easy to follow, with real small twists
- ✓ No editing complaints anywhere in our sample
- ✓ 226 pages leaves little room for depth
Emotional Impact ★★★★☆ 4.0/5
- ✓ “Rollercoaster” and “addictive” recur across reviews
- ✓ Readers finish it in a sitting and want the sequel
- ✓ The author’s duets retain readers across whole series
- ✓ A minority felt nothing much at all
Heat Level ★★★★☆ 4/5
- ✓ romance.io bands it “Explicit open door”
- ✓ I Heart SapphFic bands it “Hot & Steamy”
- ✓ A lukewarm reviewer credits the sex scenes for her rating
- ✓ Publisher’s own copy calls it steamy
Ending ★★★☆☆ 3.3/5
- ✓ No abrupt mid-scene cut reported in our sample
- ✓ Book two is published and on Kindle Unlimited
- ✓ The HEA is withheld until that second book
- ✓ One reader found the ending predictable
Re-read Value ★★★★☆ 3.9/5
- ✓ Short enough to revisit before reading book two
- ✓ A six-hour audiobook offers a second format
- ✓ Deception plots reward a second pass
- ✓ The twists lose force once known
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