The furry gang, together with Richard and Liana, have just moved into the Sooty Heights Hotel, but in the middle of unpacking they hear a mysterious squeaking noise. Convinced that the squeaking means they have mice, Richard is thrown into a panic when a letter from the Environmental Health arrives. Sooty causes havoc looking for the mice, drilling a hole in the wall to try to find them. Finally Scampi appears with a very squeaky cage on wheels - together with his pet mice.