Live the adventure with the Secret Seven - everyone's favorite detective team! These timeless stories are perfect for young mystery and adventure lovers. In the third book, the Secret Seven acquire a new meeting place - a treehouse! However, someone else is using it too. The group is outraged, but when they learn that the intruder is in big trouble and needs help, they decide to take action. Can the Seven come to the rescue? The cover and internal illustrations are by the talented Tony Ross. This edition includes the classic text and an additional section with quizzes, puzzles, and other extras at the end! Pages: 144, Dimensions: 12.8x12.8cm