Dave Mitchell and his father disagree on almost everything: Dave's music, his hair, even what makes a better pet, a dog or a cat. Dave's father thinks that a dog could be very educational. So Dave gets a cat.
Cat is a strong-willed tomcat who loves adventure almost as much as Dave does. With Cat around, Dave meets lots of new people-like Tom, a young dropout on his own in the city, and Mary, the first girl he can talk to like a real person.
As things change, Dave starts to understand his father a little better. They still don't see eye-to-eye on a lot of things, but there is one thing they can both agree on: Having a cat can be very educational, too-especially when it's one like Cat.