0Doc 2 Doc is the perfect series for parents who want to introduce science and the field of medicine to their children in a fun and colorful way.Tony and Jace have dreams of becoming medical doctors. While going about their everyday lives, these brothers get roped into some pretty interesting medical cases. In this second book of the series, Tony and Jace help a patient who has a lung problem. These two brothers learn what lungs looks like and what they do.