Like its ambitious companion novel, Replica, this far-reaching novel by powerhouse bestselling author Lauren Oliver digs deep into questions of how to be a human being in a world where humanity cannot be taken for granted.

In the world outside the Haven Institute, Lyra and Caelum are finding it hard to be human—and neither of them knows where they belong or who they can trust. When Caelum leaves without warning to pursue the dream of a place he belongs, Lyra follows him, convinced that together they will hunt down a cure for the illness that’s slowly consuming her mind. But what they uncover is a shocking connection to their past—even as their future seems in danger of collapsing.

After discovering the uncomfortable truth about her connection to the Haven Institute, Gemma struggles to return to her normal life. But when she learns that her controlling and powerful father has new plans for Lyra and Caelum, Gemma and her boyfriend, Pete, leave in the middle of the night to warn them of the danger they face.When an untimely accident derails them, they are mistaken for the escaped replicas and seized by strangers hired to capture them. The Haven Institute wasn’t destroyed after all, and now Gemma is the one behind the walls.

Lyra’s and Gemma’s stories can be read separately—with either story first—or in alternating chapters, but no matter which way you turn the book, the two distinct stories combine into one breathtaking experience for both heroines and readers alike.

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 learns 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.