St. Barth’s has a murder rate of zero. But that’s about to change.

When Audrey Collet’s ex Tyson calls, threatening to expose the skeletons in her closet unless she helps him figure out who is blackmailing him, she wants nothing more than to refuse. Though their relationship ended over a decade ago, the scars are deep. And since his tech company made him a billionaire, he’s become more than a little eccentric. . . and paranoid.

But a foot has washed ashore in the Everglades—that’s right, an actual human foot, encased in an Air Jordan—and Tyson is quick to remind Audrey that it’s one whose long-dead owner they both have a connection to. A connection that could prove problematic, if it got out.

Audrey reluctantly agrees to meet Tyson at his home on the swanky Caribbean island of St. Barth’s to help him figure out who in his entourage is extorting him, and what they know about the secrets he and Audrey share. Once there, she realizes that each person staying at Tyson’s lavish estate has a reason to wish him harm. Could the culprit be the gorgeous Belgian wife whose wings he’s clipped? The celebrity business partner he’s essentially holding hostage? The older brother who’s always been in his shadow? Or the sexy French butler he seems to trust more than he should?

Audrey has only just scratched the surface of what’s going on behind closed doors when Tyson’s birthday dive turns deadly, and she realizes one of the seven people trapped on his yacht with her is not just a blackmailer, but a murderer. If Audrey can’t catch the killer in time, she might become the next victim.