As kittens, James, Thelma, Harriet, and Roger took advantage of their wings by flying away from the busy city where they were born. Now the cats live comfortably in the country with two human friends. But a big adventure is in store for James and Harriet when they decide to return to the city to visit their mother. So much has changed! The dumpster where the kittens grew up is gone. All the buildings in their old alley are being torn down. And inside one of them is a wonderful surprise, just waiting to be discovered...