Arbie, A young red blood cell, is off to visit the lungs on his first school field trip. But when a stray gust of breath pushes him into the bloodstream, he is quickly carried far from the home and surroundings he knows. Now, lost and stranded deep within the body, Arbie will have to navigate through many an adventure and body part if he hopes to see his family again. With the help of some new friends, and a fun way of looking at how our body functions, Arbie will learn that home is where the heart is.