A thief is robbing houses in the village, leaving huge footprints that don't seem to belong to anyone.

Only Mr Goon, the village policeman, has feet that big and it can't be him!

The Five Find-Outers are soon on the trail and find the theif isn't really invisible.

It's someone they see every day, the baker delivering his bread, disguising himself with over size shoes and doing the robberies under everyone's noses.