Rajan presents her subject as someone who loved to race—not only with her feet, about the streets of her village in southern India, but in her mind, too, as she solved her older brother’s division homework at age 3 and counted while watching her Amma (mother) flip and fold savory dosas for lunch “111 times!” After she proved at age 6 that she could remember the order of a shuffled deck of cards after one glance, her father took her on the road, and she went on to perform lightning calculations and feats of memory before crowds across India and beyond. Adding only a bit more detail in an afterword, the author lightly sketches out the rest of Devi’s long career as a writer and public figure but highlights the self-confidence that allowed her to shrug off persistent accusations of cheating and also to deny that she was more than just (as she was often dubbed) a “human computer.” That strength of character comes through clearly in Prabhat’s warmly hued illustrations as Devi goes from counting groups of livestock and villagers in childhood (readers are invited to count along) to racing assuredly through increasingly long strings and jumbles of numbers as an adult, colorful sari floating behind.