"* 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.