Timothy is stuck between two sisters who monopolize his family's conversations- perhaps that's why he's developed a reputation for fibbing. When a blue cat comes down off the mountain and sits in his chair at school, however, he's telling the truth. The class adopts the cat as their pet, and the children take turns watching it over the weekend. Timothy is excited for his turn, but his landlady won't allow pets so he keeps Topcat's carrier in a tree and Topcat escapes. Timothy searches the mountain and falls and injures himself, and everyone learns the story of Topcat. His landlady agrees that Topcat can even live with them over the summer. ( )