Mickey and Amanda are put in charge of their vacationing neighbors' cat, Bella. All they have to do is make sure she has enough to eat and doesn't destroy the house. Seems simple enough. But Bella escapes from the house and disappears. Mickey thinks she may have been hit by a car but there is no body. Amanda has an idea to replace the cat with a look-alike from the local pet store Cat Heaven. They find a cat that looks exactly like Bella, but the clerk won't sell it to them, so they decide to steal it. Big mistake! These cats are more than they seem to be.