Four runaways, Mike, Peggy, Nora and Jack, find a secret hiding place—a deserted island on a lovely lake. They build a willow-tree house, make their beds of heather and bracken, and grow their own vegetables. And Jack even manages to bring his cow, Daisy, and some hens to the island for fresh milk and eggs every day! But one day invaders come to the secret island...
The parents of Mike, Peggy and Nora are held captive in the Secret Mountain in Africa. Together with their friends and Prince Paul, they run away to search for them. But can they find the mountain - and who are the strange and dangerous red-haired people living there?
When Prince Paul's father, the King of Baronia, decides to rent a whole castle in England, Jack, Peggy, Mike and Nora are thrilled. Think of the fun you can have in a castle!But this is no ordinary castle. Strange lights burn in the locked tower room, weird noises are heard and books leap from their shelves!