Charlie, Mac, and Maria are back, having defeated Dr. Gray's army in Predator Vs. Prey. Kelly and Miko, however, remain in Gray's clutches, not wanting to give up their powers and believing the scientist is trying to save the world. Using their powers and suits, the group is trying to get more animal DNA from zoos to further improve the animal qualities of the army, but when they go to Mexico to visit a zoo there, they run into trouble and the Wildes find out where they are. Maria's grandmother in Puerto Rico asks her and her friends to come to help clean up after the hurricane, and the group's animal powers come in handy there. Eventually, Kelly and Miko realize that Gray is actually completely demented and wants to turn everyone in the world into an animal hybrid, so they look into ways to escape. It's not an easy task, so they are glad when Charlie et al. show up to help them. An epic battle ensues, and Gray has two major plans; a mist machine filled with the chimera formula that he hopes will turn everyone into chimerae, and a final, last ditch attempt to turn into one himself. Will this be enough for him to win the battle, or will the good guys prevail?
Even though the reason for visiting zoos is evil (snatching bits of the animals to get their DNA; you'd think scientists would have a more elaborate method!), it's fun to go to a variety of venues and read descriptions of the animals' environments and the qualities that Dr. Gray hopes their DNA will bring to the characters. I'm just glad I'm not Miko, with her fuzzy face that she has to hide under a hoodie!
McMann's The Unwanteds is a hugely popular series in my library, so this final Going Wild volume will be appreciated by fans of those books as well as those who enjoyed stories like Patterson's The Angel Experiment (2005) and Applegate's enormously long Animorphs series (1996).