Start with high-confidence mafia romance books, then narrow by subgenre or adjacent topics.
Ruthless Creatures
J.T. Geissinger, Brooke Daniels
Brutal Vows
J.T. Geissinger
The Kiss Thief
L.J. Shen
Bad Bishop
Leave Me Behind
K.M. Moronova
Hunt the Villain
Rina Kent
Distance
Luna Mason, Noel Harrison
Detonate
Luna Mason
The Auction
Sadie Kincaid
Now You're Mine
Morgan Bridges
Once You're Mine
Nero
S.J. Tilly
King of Envy
Ana Huang, Jason Clarke
Sinner
Sierra Simone, Jacob Morgan
