A chase, a ride, a chase and hide, and Milton the mouse lands in new territory: the Stewart household. The wily escape artist has the run of the house until one fateful night when he is caught. What do you do with a mouse that hitches a ride home from a camping trip? Feed it? Turn it loose in a strange landscape? Will Milton be happy in captivity?
The children give him a cage, a nest, a wheel, and water. Matt plays Beethoven on the piano for him, and Kathleen composes a song about him. "O fie my wandering mouse, how thou dost stray" is all that Dad will say. Milton is content until one day the wild life beckons again, and he escapes. How will the children find him? Will they discover Milton's secret?