(2013) In book nine, a girl has mysteriously run away from home and her parents are frantic with worry.

Can the Secret Seven follow the clues and catch up with the girl, or will Susie, Jack’s troublesome little sister get in the way?

First published in 1957, this anniversary edition features the original text as well as extra stories, a quiz, additional artwork and insights into Blyton’s life and writing process. Both cover and inside illustrations were created by Tony Ross in 2013.