Ringer by Lauren Oliver

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… Read more.