Lyra 
 From a distance, the Haven Institute, tucked away on a private island off the coast of Florida, looks serene and even beautiful. But up close the locked doors, military guards, and biohazard suits tell a different story. In truth, it is a clandestine research facility where thousands of replicas, or human models, are born, raised, and observed. 
 But when a surprise attack is launched on Haven, two of its young experimental subjects--Lyra, or 24, and the boy known only as 72--manage to escape. As they make their way through a new and menacing environment, they meet a stranger named Gemma, who has embarked on a perilous quest of her own. And as Lyra tries to understand Haven's purpose, she uncovers earth-shattering secrets that will change the lives of both girls. 
 Gemma 
 Gemma has been in and out of hospitals her whole life. A sickly child, she has grown into a lonely adolescent whose 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 research facility. Hungry for answers, she travels to Florida, only to stumble upon two human models, or replicas, 24 and 72--and a completely new set of questions. As Gemma tries to unravel the mysteries of Haven, she learnes terrible truths about herself and her family that will threaten to destroy everything she loves. 
 Two girls, two stories, one novel. 
 While the stories of Gemma and Lyra mirror each other, each contains revelations critically important to the other story. Their narratives can be read separately or in alternating chapters. (Goodreads). 
 I loved this book. I think I've read only one other Lauren Oliver book, but she is a fantastic writer. You can tell she loves to write because of the emotions you feel as you read the book. This book is a science fiction that deals with clones. How can you get much better than that?