Mr. Goon, the village policeman, drags a mysterious bundle out of the river. This time he's sure he's on to something, but when he opens the bundle he finds nothing but doll's clothes! Poor Goon - stumped yet again!
But the Five Find-Outers (and Buster, of course) are watching. In no time at all, clever old Fatty and the others are on the trail of one of their most exciting mysteries ever!