Meet Quentin a middle school football star from Chicago Sarah an Upstate New York girls hockey team stand-out Ben a horse lover from the Pacific NorthwestAnd Cat an artistic bird watcher from California The four have nothing in common except for the head injuries that land them in an elite brain-science center in the Florida Everglades Its known as the best in the world but as days pass the kids begin to suspect that they are subjects in an experiment that goes far beyond treating concussionsand threatens their very identities Theyll have to overcome their injuries - and their differences - to escape or risk losing themselves foreverquotKate Messner combines a fascinating concept with page-turning suspense Reading this book is like a wild roller-coaster ride through the Florida swampsquot - Margaret Peterson Haddix author of The Missing and the Shadow Children series.