Surrender to Sin by Michelle St. James

Max Cartwright is out for blood.

Jason Draper may have been Max’s best friend, but endangering the life of Abby Sterling is the last straw in a long list of unforgivable sins. Following the shooting that nearly ended Max’s life, Jason is on the run, his reputation in tatters. Determined to make him pay, Max spends his time hunting for Jason and integrating Vegas’s criminal enterprise into the Syndicate’s existing operations. Then Jason returns, determined to salvage his empire by any means necessary — unless Max kills him first.

Abby Sterling is ready to heal.

Her beloved house may be gone, but she has Max, and after years of estrangement, she’s found tenuous common ground with her newly-sober father. She doesn’t know what the future holds, but with Jason out of the picture, she’s beginning to believe it will be bright when everything comes tumbling down.

When word comes that Jason has turned State’s witness against Max and the Syndicate, the clock starts ticking on their plans to eliminate him. There’s only one problem: Jason is holed up in the Presidential Suite at the Tangier, surrounded by a bigger, badder contingent of mercenaries who are being paid a small fortune to protect him.

With the help of the Syndicate and a rogue FBI agent, Max stages an assault on the suite, determined to end Jason’s reign of terror over his life with Abby. But when tragedy strikes close to home, Jason’s true depravity is revealed and Max is forced to face the fact that this isn’t the first time Jason has killed to get what he wants — and if Max doesn’t stop him, it won’t be the last.