The Sea of Adventure - S1.E4

The family have come to Wellington, New Zealand for a combined holiday and business trip. They are met by Bill’s friend, another agent, called Dennis. Dennis would like Bill’s help to solve the mystery of a missing agent who is investigating the movements of the arch villain, Perez. With Bill kidnapped, the children, marooned far from the mainland, find themselves playing a dangerous game of hide-and-seek with an unknown enemy.