The Secret Seven are siblings Peter and Janet, and Jack, Barbara, Pam, Colin and George. Together they are The Secret Seven - ready to solve any mystery, any time - in Enid Blyton's classic series of 15 mystery novels.

In book seven, the Secret Seven have a fantastic new hiding place, but somebody else has been using it too. Whoever it is is going there at night, and the gang are going to put a stop it.

They are determined to catch the cheeky intruder, whatever it takes.

First published in 1955, this edition features the original text and artwork.