Ten years after Leslie Patricelli's first board book took the toddler world by storm, she ventures into a new genre with an offbeat and funny illustrated middle-grade novel.

Lily is pretty lucky. She made a friend on the first day at her new school—even after she barfed on the playground—and now she and Darby are the only two members of the RizzleRunk Club. Darby is fun. She tells funny stories, she likes to catch frogs, and there's lots of junk food at her house. Darby is good at lots of things, too. Especially lying. Which Lily isn't. She gets that ants-under-her-skin feeling when she even thinks about doing it. But sometimes telling the truth is just too hard, so when Lily accidently does something to the class rat that she's afraid to admit, she denies it. Soon the lie feels like something awful sitting in the bottom of her stomach. Will Lily find a way to let it out?