Brother Peter and Fudge must spend the summer with the dreaded Sheila the Great. Peter Hatcher describes his family's Maine vacation highlighted by the antics of his younger brother Fudge and the presence of his sworn enemy Sheila Tubman and her family.

"The gang is heading to the campgrounds Fred went to as a boy. But when they arrive, they find the camp has been practically abandoned. A wild ape man has been wandering around the camp at night scaring away campers. Never one to run from a mystery, the Mystery Inc. gang is on the case"--