"* Raises the ante in unexpected ways until the very last page." --Publishers Weekly, starred review

"* This is a beautiful blend of science fiction, medical thriller, and teen-relationship novel that melds into a seamless whole that will please fans of all three genres." --School Library Journal, starred review

"* Outstanding examination of identity, science and ethics." --Kirkus Reviews, starred review

"Readers will respond eagerly to this provocative novel." --Kirkus Reviews, Sci-Fi/Fantasy Special

"What will hold readers most are the moral issues of betrayal, loyalty, sacrifice, and survival." --Booklist

"Fascinating and thought provoking." --Kliatt

"This novel is truly unlike any other I have ever read and is a breath of fresh air in the often predictable world of teen literature." --ELLEgirl

"This is an amazingly powerful, thought-provoking, just brilliant novel." --Teen Book Review

"An extraordinarily fine novel." --VOYA

"Gut-punch plot twists." --The Seattle Times