When construction on a postage stamp museum wakes up the Simpson family, everyone in Springfield protests its construction. It is successful, and the museum is moved to the location of the Springfield Cemetery, which is moved next to the Simpson house.
Lisa is the only member of the family whose room overlooks it. After
Bart scares her about zombies, she develops a fear of the cemetery and runs to sleep in bed with
Homer and
Marge. The next day, Marge and Homer ask Lisa to sleep in her own bed. As an early reward, they take her to the stamp museum. There, they visit an exhibit based on artwork for the book
The Land of the Wild Beasts. That night, Lisa reads the book and talks to Gravedigger Billy,
Groundskeeper Willie's cousin, who works in the cemetery. When a hand comes out of the ground, Lisa hides in Marge and Homer's bedroom. When Homer and Marge return home from their dinner party and encounter Lisa, they sleep in Lisa's room to prove there is nothing to fear. However, when they see Billy try to knock Willie into an empty grave, they also return to their bedroom. Homer and Lisa stay awake watching television, preventing Marge from sleeping, so the parents see a therapist. They admit that Lisa needed to care for herself as a baby while they handled Bart. The therapist says Lisa is suppressing her fears and recommends her book to change Lisa's mindset to that of a child. They steal the book from her. Meanwhile, Lisa decides to overcome her fear by entering the cemetery at night but is locked inside. Lisa witnesses
Dr. Nick stealing body parts while the police hunt a grave robber. When she hears the police stepping on a twig, she runs in fear and faints after hitting her head on a tombstone. When Homer and Marge return home, Bart tells them where Lisa went, so they go looking for her. Meanwhile, Lisa experiences a nightmare where she is eaten by a skeleton, encounters a spider resembling Bart, and is married to a slug resembling
Milhouse. Lisa then has a vision of the monsters from
The Land of the Wild Beasts and learns that it is reasonable to be scared. They advise her to close the curtains so she cannot see the cemetery. At dawn, Marge and Homer find Lisa and take her home. ==Cultural references==