Captain Gerald reports to Priscilla that an abandoned houseboat, which had been moored anonymously in Vineyard Haven Harbor, has been discovered in the bay with apparent signs of foul play. Who is the boat’s owner, and what happened to him? Many people in town report having seen a man on board with his dog, but no one seems to have so much as a guess as to his identity. When Priscilla follows the siren’s call to solve this mystery, she finds clues that tie her family to the case in a way no one could have foreseen. Can she find answers before she, too, is the subject of a missing-person report?