Freddy the Pig is going undercover. When Mr. Camphor tells Freddy about an abandoned summer hotel and the unfriendly ghosts that live there, Freddy smells a rat-Simon the rat. Determined to find out just what his old enemy is up to, Freddy needs the perfect cover-up: camping! So Freddy packs up the sleeping bags, tents, and frying pans and heads out to the woods to expose Simon's scheme. But when the evil Mr. Eha starts skulking about, Freddy and his pals know that they'll have to do some serious detecting to get to the bottom of the mystery.