"A Bargain for Frances", by Russell Hoban, pictures by Lillian Hoban - When Frances goes to play at Thelma's, her mother tells her to be careful, because Thelma usually outsmarts Frances. Frances decides to teach her a lesson about friendship, and how being careful is no fun. An I Can Read! book from 1970, starring the irrepressible badger Frances. See also "Bread and Jam for Frances".