Nine is just the right number. Ketem the bookstore cat is house-hunting. Professor Buber’s house looks perfect, but the local cats tell Ketem the famous writer doesn’t want any pets. He once let his cat distract him when a man came to him for advice, say the cats. Since then, no more cats, they say. But Ketem has a plan to make Professor Buber's house his own, and enlists a group of neighborhood cats to help. Based on a true story of Martin Buber's cats.