'Oh Anne, you're right! Someone was looking in at the window! And if we saw him, he must have seen us!'
Anne and John are camping out and eagerly awaiting the boys arrival. But one night, Anne sees a mysterious face at the window of the ruined cottage close by - and then the others see ghostly lights ... Anne wants to go home but the others are determined to stay. Who is snooping around the cottage - and why is a nearby gang trying to make the Five leave?
This softback book written by Enid Blyton with inside illustrations by Eileen Soper was originally published in Great Britain in 1956. This edition was published in 2016.