Seth Fishman

To escape Blake Sutton’s army at the end of the enthralling The Well’s End, Mia and her friends jump into the newly gurgling fountain of youth and swim to its very bottom. When they resurface, an astounding world awaits them—an entire underground civilization of humans, the Keepers of the Well.
 
But instead of finding a safe haven, Mia and her gang are quickly embroiled in a dangerous, high-stakes battle royale....

Seth, a self-proclaimed bad drawer, works together with his friends to bring his super fantastic story to life.

"An exploration of the five main types of germs--bacteria, viruses, protozoa, fungi, and helminths--and the human immune system that protects us against them"--

"The Earth's five oceans and its water cycle connect all of us in important and unexpected ways"--