In 1619, the pirate vessel Sea Devil captures the Spanish cargo ship Santa Susanna. The victory is short-lived — a violent storm catches the Sea Devil and wrecks her on the remote, uncharted Cutthroat Island. Of the entire crew, only one man makes it off the island alive: Fingers Adams. Before death takes him, Adams divides a map of the island into three pieces and passes each to a different legitimate heir. By 1688, one of those pieces has found its way to pirate Morgan Adams, who is already a wanted woman. Driven by the promise of hidden treasure, Morgan sets out to find the remaining two pieces — knowing that the law and competing treasure hunters will both be trying to stop her.