"The Monsters are Due on Maple Street" takes place in Maple Street, U.S.A., late summer, and is the home of Steve Brand, Don Martin, Mrs. Brand, Woman, Pete Van Horn, Charlie, Charlie's wife, Les Goodman, Mrs. Goodman, Tommy, Sally, and others.
Something large shoots across the sky, and neighbors all around the neighborhood step outside to look at what it was. All things electrical go out, every car, stove, lamp, phone, radio went out.
In the midst of the confusion, a 14-year-old boy plants the ideas in everyone's heads that the flying object in the sky is a spaceship, and that aliens were coming. The boy also said that the aliens have one living among the people, acting as a human when they really aren't. This causes people to be suspicious of each other, especially the neighbor whose car turned on by itself.
Everyone has turned on each other, not knowing who is the alien and who is innocent. No one can trust anyone, and out of confusion, Charlie pulled out his shotgun and shot Pete Van Horn, killing him.