A family of mice who live inside of a wall are trying to sleep, but Mom mouse is being kept awake by a dog snoring in the room outside of their hole. She wakes up Pop mouse, and has him go out to try to stuff cotton in the dog's mouth. Later, Pop Mouse goes out again to find some food. He finds a large piece of cheese, but he encounters some problems in trying to bring back enough for anyone else to eat.

Private eyes Mutt and Jeff are on the trail of the ghostly shape-shifting criminal, the Phantom.

When a mysterious figure appears to cause a series of disruptions at the Frisbie Home in New York, word goes out to Scotland Yard that the Fuzz-Faced Phantom is at work. Soon, Charley MacNeesha and his assistant MacGregor are sent across the ocean to investigate.

Charley invents a machine that turns ordinary, breakable eggs into rubbery, unbreakable ones for transport. He builds a Rube Goldberg contraption of parts stolen from his neighbors. Rival egg companies want his invention, one of them stooping to sabotage to get it.