Dark Romantasy / Dark Fantasy
Unholy Vows: A Novel (Original Sin Series)
Book 1 in the Original Sin 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 mafia dynasty saga where unholy vows bind two dangerous souls together. Ruthless power plays meet a romance built on mutual ruin.
At a glance
Unholy Vows is book 1 in Mila Kane’s Original Sin series. With 3/5 for spice and 4/5 for darkness it sits mid-range for dark romantasy (of the 648 dark romantasy books on Readark, 34% rate lower for darkness and 8% lower for spice). Its tropes include revenge, morally grey MC and possessive-obsessive MC. It is about as dark as Mila Kane’s other books on Readark (average darkness 4.0/5). It runs to 384 pages. 1 content warning is listed below, hidden until you tap.
Book details
- Pages
- 384
- Published
- February 2026
Unholy Vows spice level
Unholy Vows is rated 3/5 for spice on Readark’s scale: open door, meaning explicit scenes written plainly, but not the engine of the book. Its darkness rating is 4/5: heavy, meaning sustained cruelty, trauma or non-consent central to the relationship. How we rate
Unholy Vows content warnings
We list 1 content warning for this book. It stays hidden until you tap, so you can check without spoilers.
Content warnings (tap to reveal)
- Graphic Violence
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Content warnings (tap to reveal)
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