The Mystery of the Mysterious Man — Paul Moxham

While picnicking at Willow Lake, the Mystery Kids don't pay much attention when they spot a man rowing to the small island. However, when another man rows there as well, shortly after the first one has departed, the children's suspicious are aroused.

What could be happening in such a peaceful and desolate spot? What secret does the island hold? Why is Mr Peterson acting so suspiciously?

Set in 1950's Britain, this adventure story will suit anyone who enjoys Nancy Drew, the Hardy Boys or the Famous Five.