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 3: Well Done, Secret Seven The Secret Seven have a new meeting place - a treehouse! But someone else is using it too. The gang are furious, but then they learn the intruder is in big trouble and needs their help. Can the Seven come to the rescue? Book 4: Secret Seven on the Trail Something mysterious is going on at Tigger's Barn, and the Secret Seven are intrigued. Peter thinks it's all just gossip, but Jack isn't so sure when he overhears a strange conversation. Looks like the Seven are on the trail of another exciting adventure. First published in 1951 and 1952, this audio CD edition contains the original text. Both stories are abridged and dramatised with a full cast. - from Amzon