On a visit to a seaside town in Australia, Sam meets Annabel, who works at a museum. Annabel's interest in history is infectious, and Sam soon finds himself eager to hunt for the remains of a boat called the Mahogany Ship. When a storm creates an erosion hole that exposes a structure, Sam and Annabel are convinced it's the fabled ship. Soon all of the museum staff are at the erosion site. But the same storm also destroys the museum's power; someone knows the alarms aren't working and steals the museum's $4 million most treasured artifact. As Sam and Annabel search for the thief, they realize there may be a link between the fabled shipwreck and the recent theft.