The Enid Blyton Adventure Series

Season 1, Episode 4: The Sea of Adventure

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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.