A turbulent end to their second lifetime, propels the twins into their final lifetime, a dystopian wasteland. Evelyn and Noah become desperate to reach Siena and Warrick, but an Ancient stranger, Kroden, emerges.

In the dwindling hours of the twins' last day, everyone descends on Westbrook. The Breach is opened, but the climatic and bittersweet reunion leaves some descendants robbed of their escapes and others, of their lives.