Three Cheers, Secret Seven - Secret Seven No. 8

Synopsis

An old abandoned house near to where the gang live has been empty for years, but now the Secret Seven aren't so sure! When Peter and Jack go looking for a lost model aeroplane, their trail leads them into the house, where they see a gas fire - and it's alight. Someone is living here, after all, and the whole gang mean to investigate who it is, and what they're doing there!