When the summoning of the Memory Demon reveals that it's not only Clary's memories that have been meddled with, Alec finds himself being pushed off the path set out for him and onto a different one.

After the events with Deucalion and Jennifer Blake, Derek goes on a search for his biological family. He, Stiles, and Cora head to New York City to try to find the family he doesn’t remember. It turns out that there was a lot to his adoption that he never knew.