There's nothing to do on a rainy day--or so Ally thinks. But Mama says she's seen something amazing, so despite Ally's misgivings, she sets out on an adventure with her mother and grandmother.

On their journey, she sees all sorts of things: dripping awnings, wet cardboard, splashing cars...but also earthworms, storm drain geysers, and oil slick patterns. And then they turn the corner, just in time to see a big crowd. What's happening?

Lyrical text from Sandra Markle and stunning paintings from New York Times best-selling illustrator Thomas Gonzalez tell a captivating, multigenerational story of a toad migration, inspired by the real-life Toad Detour in Roxborough, Pennsylvania.