The Enid Blyton Secret Series

Peggy, Mike and Laura are staying with their horrible Aunt and Uncle while their eccentric father, Thaddeus sails around the world, accompanied by photo journalist Charlotte Clancy. But in the aftermath of an unexpected storm, Thaddeus and Charlotte are presumed drowned and the children's Uncle and Aunt see this as not only the perfect chance for inheriting Thaddeus's estate - but selling it.

After retreating to an island, the children befriend Jack, an orphan who has run away from home. Unbeknownst to the children, their father Thaddeus and Charlotte are still shipwrecked on an island themselves. Uncle Henry and Aunt Harriet having discovered that the children have run away, decide not to tell anyone in case it reveals their plans to sell the estate.

As the children take shelter in a secret hideout, they soon discover the identity of the ghost on the island to be a kind, old monk who has taken refuge. Aunt Harriet and Uncle Henry try somehow to prevent the authorities from closing in, having been alerted to their insidious plan by Lord Foggo, chairmen of the explorers club and mentor of Thaddeus.

Aunt Harriet and Uncle Henry continue to try and stop the authorities from finding the children. Meanwhile, Thaddeus and Charlotte find themselves facing unexpected dangers as they attempt to survive on the desert island and agree to place their differences to one side so that they can work together.

Thaddeus and Charlotte embark on a book tour, leaving the children with their wacky nanny - Ruby. While exploring, the children discover that nearby to their house a boy is being held prisoner and his identity is eventually revealed to be the kidnapped Prince of Baronia, who is being held by the King's brother who plans to usurp the throne.

While the children attempt to rescue the young prince, Charlotte discovers that Thaddeus has been kidnapped from their hotel on the book tour, and she sets out to solve the mystery.