Merrin and Pearl’s cousin Max is sick, threatening everyone’s Mexican holiday. This time the girls find themselves in Max’s body, witnessing first hand the immune system in action. They befriend a white blood cell warrior who leads them into battle against the offending bacteria. Human Body Detectives: Battle with the Bugs Heather Manley Book Trailer Find out more about this author here http://www.drheathernd.com Find out more about this book http://www.humanbodydetectives.com Children