In of A Discovery of Witches (originally aired January 2022), the story centers on the heartbreaking return of Diana Bishop and Matthew Clairmont from the 16th century to the present day. The key plot developments include:

Diana and Matthew arrive at Sept-Tours to find the family in mourning. They learn that Emily Mather was murdered by Peter Knox at the end of Season 2.

The episode introduces Benjamin Fuchs , a "blood-raged" vampire Matthew sired and abandoned centuries ago. Benjamin is revealed to be a brutal killer currently stalking the family.