Ten-year-olds Malcolm and Dandy think their ghost-hunting days are over when they start fifth grade with the toughest teacher in their school, but Malcolm's photographs for the yearbook reveal that the school is haunted.

The day before -- Up and at 'em -- Slow ride -- Grueling goolsby -- Tell no one! -- A muddy excuse -- Fishing for answers -- In and out -- Solving one problem, creating another -- Identified -- Happy anniversary!