Secret Seven: Secret Seven Adventure Collection by Enid Blyton - old hardcover
The Secret Seven super-sleuths are always on the trail of a mystery. Whether they're investigating a spooky house in the snow, a missing pearl necklace, an intruder in their treehouse or mysterious happenings at Tigger's Barn - you can rely on the Secret Seven to get to the bottom of things!
Go Ahead, Secret Seven
Secret Seven Win Through
Good Work, Secret Seven
Three Cheers, Secret Seven