From there the story zooms in on the microscopic events happening beneath Mayu’s skin. The leader is Captain T, the helper cell, who explains the injury and initiates different immune responses designed to protect Mayu from infection. Like tiny, blob-like warriors, different cells such as neutrophils, platelets, and macrophages work together to seal off the wound and fight harmful bacteria, clearly demonstrating the body’s multifaceted response to different threats. Notably, the kids in this story are not wearing bicycle helmets, a missed opportunity to help normalize basic safety gear kids can use to protect themselves.

Tamika Bramwell’s colorful illustrations depict the immune heroes as grinning, wide-eyed, alien-like creatures with a variety of wacky characteristics like green, squiggly hair and long, spiky legs that mimic their true-to-life appearance. The single-minded cells talk to each other and work together to keep out the bacteria, which have between one and three eyes and tiny teeth and multiply rapidly. As Mayu’s body fights the intruders, his face relaxes, and soon he is again ready to play. Showing cells and bacteria in this way will keep kids engaged while also introducing them to the fascinating science of the human immune system.

Takeaway: Enlightening picture book reveals the science behind the human immune system.

Comparable Titles: Steve Haines’s Pain Is Really Strange, Judith Wolf Mandell’s Sammy's Broken Leg (Oh, No!) and the Amazing Cast That Fixed It.

Production grades
Cover: B+
Design and typography: B+
Illustrations: B+
Editing: A-
Marketing copy: A-