When Gabby St. Claire's ex-fiancé, Riley Thomas, asks for her help in investigating a possible murder at a couples' retreat, she knows she should say no. She knows she should run far, far away from the danger of both being around Riley and the crime. But her nosy instincts and determination take precedent over her logic. At the retreat center she feels like she's stepped into the pages of a creepy gothic novel: an isolated island that's often foggy, an old lodge with a dark history, and a small pool of suspects who each have either motive, means, or opportunity for murder. When another life is threatened, the risk intensifies. Gabby and Riley must work together to find the killer. In the process, they have to confront demons from their past and deal with their present relationship. If they don't learn to trust each other, they could both end up as fodder for the supposedly cursed island's folklore.