A brother and sister will not put away their toys at the end of the day, no matter what their mother says. When Mom reminds Joey and Lisa about the mysterious Madame Cat—who comes in the night to gather the toys that children refuse to put away—the children will not believe the story. After their toys disappear, the children stay up past bedtime and lay a special trap for Madame Cat—to see if she is real. Will the cat in the green taffeta gown take the bait?