Merrin and Pearls little brother Robbie has swallowed a penny! Through magic and imagination they find themselves on an adventure through his digestive system where they must grab the penny, save Robbie and narrowly escape his poopy diaper. Through their journey down the esophagus, into the stomach, and through the intestines, the girls experience some close calls - almost being squirted with hydrochloric acid and being bumped by gas bubbles. Their encounters force them to learn first hand all about the digestive system and why it is so important to eat healthy foods. Ideal for ages 4 to 10.