In Battle with the Bugs, the girls find themselves in their cousin Max’s body, witnessing firsthand the immune system in action. This book includes 23 pages of educational activities, 44 color stickers and an audio story CD.

In A Heart Pumping Adventure, Merrin wonders about her father's eating habits and the condition of his heart. Suddenly, Merrin and Pearl find themselves riding on a red, pillowy donut-shaped boat, floating through his bloodstream. This book includes 23 pages of educational activities, 44 color stickers and an audio story CD.
— “It is, to be honest, one of the most interesting and engaging human body learning tools I’ve come across in a very long time,” declared Robin Rivers of Our Good Earth.  Exploring the set with her daughter, Robin was surprised at “how much she took to the story, the lessons (eat healthy to have a healthy body) and the educational content that at times was a bit beyond her 5-year-old level.”
— The reviewer at One Zillion Books listened to the CD with her kids and noticed “that there were a couple of vocabulary- and concept-heavy moments, but overall the fun mood carried throughout the 15+ minute audio story.” She rated the set eight out of ten because “The story and characters were easy to relate to and led well into the activity book focusing of human anatomy and healthy living” while remaining “neither dull nor scary.”

In The Lucky Escape, Merrin and Pearl are magically catapulted into their baby brother’s digestive system to help him extract a penny he swallowed. This book includes 23 pages of educational activities, 44 color stickers and an audio story CD.