The little black kitten, Belle, thought she was very lucky. Not only was she adopted by a nice family, but there were other cats to get to know. However, Belle who loves mystery and adventure found there is more than meets the eye about one of the cats - Mittens, the leader of the Clowder. It is a secret going back over 3000 years.

Now Belle, her best friend Giblet and her allies are drawn into a world that threatens her new family. Can she measure up and learn what she needs to know in order to solve the case in time?