Arthur thinks his pen pal is more fun than his little sister. Little sisters don't do things like karate and wrestling -- or do they? It takes a surprise letter to show Arthur that sometimes there's more to sisters -- and pen pals -- than meets the eye!

Lillian Hoban was the author and illustrator of many favorite I Can Read books, including Joe and Betsy the Dinosaur, Silly Tilly's Thanksgiving, and a series about Arthur the Chimpanzee. She also illustrated many picture books, including the classic stories about Frances.