Jack's little sister Susie is very annoying and the Secret Seven are furios when she forms a rival club. But is Susie wicked enough to have stolen some money?
The SEven are desperate to help Tolly and his sick horse, Brownie. But where can they hide an old man and his horse? And can they protect Brownie from thieves?
A car is stolen - Peter and Janet witness the theft! Now the Seven are on the trail of a dangerous gang.