Four kids . . . Two weeks in the Florida Everglades . . . One top-secret science experiment that could change them and the world as they know it . . . Meet Quentin, a middle-school football star from Chicago; Sarah, a hockey player from Upstate New York; Ben, a horse lover from the Pacific Northwest; and Cat, an artistic bird watcher from California. The four have little in common except the head injuries that landed them in an elite brain-science center in the wild swamps of Florida. It's known as the best clinic in the world and promises to return their lives to normal, but as days pass, the kids begin to notice strange side effects and unexplained changes.