Mallory and the Ghost Cat — Ann M. Martin

America's-favorite baby-sitters are ghost hunters, too!

One night when Mallory is baby-sitting for the Craines, she hears a cat crying somewhere in the house. But the Craines don't own a pet. So Mallory and the girls go exploring -- and discover a mysterious white cat hiding in the attic. They name him Ghost Cat, and the mystery is solved. They think.

Until Mallory and the girls continue to hear eerie cries coming from the attic. If Ghost Cat is sitting right there with them, who -- or what -- is upstairs in the attic?