After escaping from two very different prisons, Toby and Epsilon 17 finally have a chance to live for themselves. Helping to build a new city in the wake of the destruction of the Institute should be all they're worrying about, but Epsilon 17 has a horrific secret that's getting harder and harder to hide. Cassandra isn't dead, she's locked up in the deepest, darkest corner of E17's mind. Pushing E17 to the brink of madness, Cassandra is determined...