At first glance, David and Diana Scott appear to be two siblings with nothing more to do than appreciate the excellent Mediterranean vistas from the deck of the S.S. Goneril. But they are making their voyage along the European coast with a very singular purpose in mind: their solicitor father wants them to find a missing heir to an English fortune. As a boy, Paul Capoulos went missing when his mother died abroad, and it is the Scotts’ daunting task to pick up his trail. In Venice, a shady contact sends the hunters to a doll shop in Yugoslavia, and while they wind their way up the Adriatic, a lady traveler and history professor named Baptista Webster appears to take an uncommon interest in their destination. Unwilling to trust anyone—a sizeable fortune is at stake—David and Diana try to keep their cards close to their vest.