The Teeny Tiny Ghost by Kay Winters

Each day the teeny tiny ghost goes to haunting school to try to become scarier. It's hard work, though -- especially since he's frightened by his own screams! Then, one bat-black October night, the teeny tiny ghost is floating in his teeny tiny home when he hears a RAP TAP TAP on the door. And then he knows it's up to him to keep himself and his teeny tiny cats safe. But what are the chances that a teeny tiny timid ghost will really be able to scare someone away?