The family have been telling their deepest, darkest secrets to Cat for years. But when Cat finds one of Mouse's inventions that gives her intelligence and speech, she threatens to tell all their secrets if they don't do everything she asks. The kids must decide between living under their feline pharaoh's thumb or confessing their secrets to each other.

When Mouse brings home an old ice cream truck, the kids start their own smoothie business. However, the town's lovable ice cream man, Uncle Bub, isn't happy about the competition.