Mafia / Mob Romance
Sinful Promise: A Bodyguard Russian Mafia Romance (Koslov Bratva)
Book 6 in the Koslov Bratva (Kira Cole) series · Reading order →
SpiceDarkness
- Kindle, paperback & audiobook on Amazon
- Spice & darkness rated — content warnings listed below
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Why we recommend it
A bodyguard Russian mafia romance where a sinful promise becomes a bond neither side can break. Possessive power plays meet slow-burn devotion.
At a glance
Sinful Promise is book 6 in Kira Cole’s Koslov Bratva (Kira Cole) series; to read in order, start with Sinful Oath. With 4/5 for spice and 3/5 for darkness it sits on the lighter side for mafia romance (of the 931 mafia romance books on Readark, almost none rate lower for darkness and 24% lower for spice). Its tropes include boss / employee, dark protector and possessive-obsessive MC. Boss / employee is one of the less common tropes in our catalogue. It is lighter than Kira Cole’s other books on Readark (average darkness 3.8/5). It runs to 332 pages. We have not tagged its content warnings yet, so check the author’s notes before you start.
Book details
- Pages
- 332
- Published
- February 2025
Sinful Promise spice level
Sinful Promise is rated 4/5 for spice on Readark’s scale: explicit and frequent, meaning multiple detailed scenes, with heat central to the story. Its darkness rating is 3/5: genuinely dark, meaning violence, coercion or captivity drive the plot, not just the mood. How we rate
Sinful Promise content warnings
We haven’t tagged content warnings for this book yet. If you have specific triggers, check reader reviews before you start.
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