It’s a hot summer day and the Seven are fed up of having their meetings in Janet and Peter’s stuffy garden shed. Due to this the children decide to visit Windy Woods and build a tree house. In the tree house they find a cubbyhole where they can store food and games. There are also wooden planks and a rubber sheet tied to a branch high up in the tree, so the children could safely sit down on cushions.

          The story starts to come to life when Janet gives Colin a book to read about ships. On the same day, a storm breaks out and Colin realises he has left the book in the cubbyhole of the tree. This leads to Colin and Peter going on a nail-biting midnight trek to find the book up the tree but they are not alone and realise some of their biscuits and chocolate have disappeared.