Iggy is not feeling well so the Nutmegs make Heathcliff stay home to take care of him while everyone else goes to the circus. Heathcliff gets his pet friends to put on a circus of their own, but he also has to stop some robbers from stealing the family's furniture.
Heathcliff struggles with his conscience when he learns that Johnny the mouse is missing, but he finally decides to do the right thing and help Johnny get home safely.
When Heathcliff can't get in to visit his dad in prison because Pops has lost visiting privileges, he goes on a crime spree so that he'll be arrested and can get inside.