Dark Alliance by Sienna Snow

In Las Vegas, power is the ultimate gamble.

Daphne has always belonged to Zeno—at least in the eyes of the empire he built. But one forbidden glance across the poker table shatters her carefully controlled loyalties. Thalassios Adrias isn’t just a rival; he’s the man she should never want again…and the one temptation she can’t escape.
As old enemies rise from the shadows, alliances blur, and every secret threatens to ignite a war. Desire becomes betrayal. Loyalty becomes a weapon. And when the city’s most dangerous syndicate strikes back, Daphne must choose: the man who saved her life, or the man who could set her free.

Dark Alliance is a dark mafia romance of forbidden love, dangerous games, and high-stakes passion. Perfect for fans of ruthless antiheroes, powerful heroines, and the intoxicating pull of love that should never have been.