When Mr. and Mrs. Peppermint take a trip out west, Pete, Patty, Peggy, and Philpot assure their parents that they can hold down the fort while they are gone. With the help of Mr. Peppermint's mother, Mimi, the children prove they can handle more responsibility. Mr. and Mrs. Peppermint come across the perfect souvenir in California that may be the surprise of a lifetime