Season 3 picks up immediately after the events of Season 2, with Diana and Matthew returning from 1590 to the present day. However, their homecoming is bittersweet:
: They arrive to find that Peter Knox has murdered Diana’s aunt, Emily Mather. A Discovery of Witches - Season 3
: Matthew focuses on finding a cure for "blood rage," a vampire affliction that threatens his family and is being manipulated by his sadistic sired son, Benjamin. A Growing Family and New Stakes Season 3 picks up immediately after the events
: The main mission remains finding the missing pages of the Ashmole 782 manuscript to safeguard the future of all creatures. A Discovery of Witches - Season 3
This season expands the emotional core of the series by focusing on family and legacy. A Discovery of Witches Season 3 – Spoiler review