Human Body Detectives Merrin and Pearl are at it again. Their magical ability to jump into people's bodies and explore their systems (digestive, skeletal, nervous ( June 2014), circulatory, and immune) combines science with their fun adventures to help kids understand their anatomy and how their bodies work. In A Heart Pumping Adventure, Merrin and Pearl enter their dad's circulatory system to explore how healthy his heart is after they see him overindulging in a very unhealthy breakfast. During their journey, they ride on a red blood cell through the lungs, get lodged in a blood vessel by fatty buildup, deliver oxygen to the body, and so much more. In the end, they not only learn about what foods their dad should eat to keep his heart working well, they also get a firsthand lesson on the functions of the circulatory system. A Heart Pumping Adventure is one of five stories featured in the Human Body Detectives series, along with Battle with the Bugs, Osteoblasts to the Rescue, The Lucky Escape, and Brainiacs, debuting in June 2014.