Enid Blyton The Secret Seven 15 Story Collection in 5 Books Set:

The Secret Seven Collection 1:

Book 1: The Secret Seven: It's their first adventure and the Secret Seven super-sleuths! Book 2: Secret Seven Adventure: When a priceless pearl necklace goes missing the Secret Seven are first off! Book 3: Well Done, Secret Seven: The Secret Seven have a new meeting place - a treehouse!

The Secret Seven Collection 2:

Book 4: Secret Seven on the Trail: Something mysterious is going on at Tigger's Barn. Book 5: Go Ahead, Secret Seven: What exactly is the sinister-looking man up to and why does he want to get? Book 6: Good Work, Secret Seven: A car is stolen and Peter and Janet are the only witnesses.

The Secret Seven Collection 3:

Book 7: Secret Seven Win Through: The Seven have a fantastic new hiding place. Book 8: Three Cheers, Secret Seven: Peter and Jack see a gas-fire alight in one of the rooms. Book 9: Secret Seven Mystery: A girl runs away from home - and it's up to the Seven to find her!

The Secret Seven Collection 4:

Book 10: Puzzle For The Secret Seven: In book ten, the gang witness the horror of a house going up in flames. Book 11: Secret Seven Fireworks: In book eleven, Jack's little sister, Susie, is so annoying! Book 12: Good Old Secret Seven: In book twelve, there are strange happenings indeed at Torling Castle!

The Secret Seven Collection 5:

Shock for The Secret Seven: Book 13: dogs are disappearing from the village but the Seven are so busy arguing that they don't even notice! Look Out, Secret Seven: Book 14: In book fourteen, Scamper discovers an unwanted visitor and later protects the Seven. Fun for The Secret Seven: Book 15: the Seven are determined to help Tolly and his sick horse Brownie.