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. Book 1: The Secret Seven It's their first adventure and the Secret Seven super-sleuths are already on the trail of a mystery! The gang are dressed in disguise, following a lead to a spooky old house in the snow...Book 2: Secret Seven Adventure In book two a priceless pearl necklace goes missing. The Secret Seven are first off the mark to catch the thief. Why? Because they saw him making his escape! Now all they have to do is find the necklace.