Peter Hatcher is horrified to learn of his family's plans to spend summer in a vacation home alongside the Tubmans, the family of his archrival, Sheila, located in Southwest Harbor, Maine. On the other hand, his younger brother, Fudge, who is five years old, anticipates the vacation because of his plans to marry her as a means of protection against the supposed "monsters" hiding beneath his bed, knowing that spouses often share one. This wish is pacified and dropped after a newfound friend named Mitzi Apfel provides him with a bottle containing her grandmother's "monster spray" during the vacation, but Peter is stunned to learn that she is the granddaughter of an idolized baseball player known as "Big Apfel".
Peter Hatcher is shocked by his family’s decision to spend their summer in a vacation home near the Tubmans, Sheila’s relatives in Southwest Harbor, Maine. On the other hand, Peter's younger brother, Fudge, who is five years old, looks forward to the trip because he plans to marry Mitzi Apfel for protection against the "monsters" under his bed, knowing that spouses often share one. This wish is pacified when a new friend named Mitzi Apfel gives him a bottle containing her grandmother's "monster spray," but Peter is stunned to learn that she is the granddaughter of an idolized baseball player known as "Big Apfel."