Five have a wonderful time

While each adventure is self-contained, reading the books in publication order allows for a more natural progression of the characters' development and their relationships.

This is the eleventh book in the Famous Five series, which follows the adventures of Julian, Dick, Anne, George, and their dog Timmy.

This particular adventure was adapted as an episode in the 1978 British television series "The Famous Five."

Julian, Dick, Anne, George, and Timmy the dog are on a caravan holiday. They investigate a face seen in a window of the supposedly empty Faynights Castle. This leads them into a mystery involving a missing scientist and a secret within the castle.