Split Nine Ways: The Don’s Heir Made Me a Bet

Nora Calloway, a brilliant researcher with a gift for numbers, has been in love with Darian Marchetti, heir to a Mafia don, for three years. Then she discovers that every sum of money he has ever spent on her is divisible by nine. Darian’s wife, Celeste, takes Nora to a secret surveillance apartment across the street, where Nora learns that their romance began as a wager.