Sally Tinker, the world's foremost inventor under the age of 12, is back with a new adventure in invention. The third book in the S. Tinker Inc. series of graphic novels is a gut-wrenching, stomach-turning escapade into the human body.

Sally has been testing brain-enhancing nanobots - but now they've been accidentally swallowed by her baby brother Joe. The only way to stop Joe turning into a superbaby and wreaking super havoc is to shrink herself and travel inside Joe's body on a journey to tackle the problem head-on. What could possibly go wrong? As it turns out, this is only the beginning.