While on vacation, James and Mandy discover a boat called Puss-in-Boats. It's a houseboat filled with cats! Mrs. Browne and her son live there with the village's abandoned cats. Mr. Pengelly, a man from the village, wants the Brownes to take their pets and move away. He thinks they are crazy for having so many cats. But Mandy knows the Brownes are just cat crazy like she is! How can she save the cats' home?