In 1619, the pirate cutter Sea Devil captures the Spanish cargo ship Santa Susanna — but never makes it home. Caught in a storm, the Sea Devil wrecks on the uncharted Cutthroat Island, with only one survivor: Fingers Adams. Dying, he splits the treasure map into three pieces and leaves each to a legitimate heir. Nearly seventy years later in 1688, Morgan Adams — already wanted by authorities and holding one map piece — launches a quest across hostile waters to recover the remaining pieces and reach the buried treasure, fighting both the law and ruthless rivals every step of the way.