As Halloween approaches, a practical joker targets the kids of Oakdale, and the jokes are starting to get out of hand, so Wishbone and his friends set out to find the joker before the special costume party is ruined.

Joe, Sam, and David are happy to become counselors at a nearby summer camp, but when spooky things begin to happen, Wishbone and his friends investigate whether the camp is really haunted, or just the target of a prankster.

Wanda Gilmore's reputedly haunted ancestral home will be hers if she can spend three nights there, with a little help from Wishbone and the gang, but someone—or something—wants them to leave.

Wishbone and David help Joe Talbot search for a jeweled watch that has been missing for twenty-five years, and try to keep the lake where Joe's father spent his boyhood summers from being developed.