London based lawyer Kyra Gibson returns to Martha's Vineyard and the beach house she inherited for an extended summer holiday. Still reeling from her father's brutal murder and the role she and the handsome detective, Tarek Collins played in uncovering it, Kyra is hopeful for some peace and quiet. But when a summer squall reveals the wreckage of the pirate ship, Keres, rich with rumored treasure, all hopes of peace are dashed. Conservationists and treasure hunters descend on the exclusive island to lay claim to the ship. When two of the salvagers are killed, Kyra and Tarek's friend, pub owner and amateur historian, Gully Gould is arrested for murder.

Determined to prove Gully's innocence, Kyra, Tarek, and reformed playboy Chase Hawthorn team up to clear their friend's name. But someone wants the treasure for themselves. And with someone willing to kill for it, there is more than just danger lurking along the island's caves and coves. There is death.