Eddie, tired of show-off Courtney, comes up with a plan to lure her down to Muddy Creek and scare her with the rumors of creepy Mud Monsters, but he makes his first mistake when he refuses to believe the rumors himself.
Jerry, intent on exploring the dark, spooky old cave he discovered down by the beach, makes a poor choice when he ignores his friends' warnings about the ghost that lives in the cave.
Camp Cold Lake is no fun for Sarah, and she is not getting along with her bunkmates, but when she decides to pretend to drown, she realizes someone very strange has been watching her.
While visiting London, Sue and her brother get separated from the tour group and find themselves trapped in a prison tower and transported back in time.
During a stay at King Jellyjam's Sports Camp, Wendy thinks the counselors are a little too happy--eerily happy--and concerned about winning, but her "sports freak" brother is not convinced.
Hill House is the biggest tourist attraction in town. Duane and Stephanie love it because it is dark and creepy and really scary. Still, they've never seen a real ghost until the night they decide to go on a search.