From the New York Times bestselling author of BEFORE I FALL and the Delirium Trilogy, come two astonishing stories in one epic, masterful novel that explores the issues of individuality, identity, and humanity. Turn REPLICA one way and read Lyra's story; turn the book over and upside down and read Gemma's story! Lyra's story begins in the Haven Institute, a building tucked away on a private island off the coast of Florida that from a distance looks serene and even beautiful. But up close the locked doors, military guards, and biohazard suits tell a different story. Gemma has been in and out of hospitals for as long as she can remember. A lonely teen, her life is circumscribed by home, school, and her best friend, April. But after she is nearly abducted by a stranger claiming to know her, Gemma starts to investigate her family's past and discovers her father's mysterious connection to the secretive Haven Institute. While the stories of Lyra and Gemma mirror each other, each contains breathtaking revelations critically important to the other story. REPLICA is an ambitious, thought-provoking masterwork.