In his short time back on Earth Jacob has realized that his unlikely friendship with Jem has led him into something he could never have imagined, but that something within him is driving him to stay and join the fight. In an instant Jacob is confronted with his past and with a future that he might not ever be able to have.
With the battle with the hybrids over, most of the group is recovering and working to heal the wounded, but Eden can't get the voice of the dying hybrid out of her head. Together they explore the abandoned hospital further and discover something that will bring the full magnitude of Ryan's experiments, and the danger that they all face, into closer focus.