In A Discovery Of Witches season 3, star-crossed lovers vampire Matthew de Clermont and witch Diana Bishop, who’s now pregnant with twins, return to the present day after hiding out in Elizabethan London during season 2. They immediately face tragedy, however, when Diana’s beloved Aunt Em is killed by evil witch leader Peter Knox.
Determined to avenge Em’s death, Diana knows she must turn her power into a destructive purpose, something she’s previously resisted. With enemies joining forces, it’s also a race against time to find the Book of Life and overthrow the all-powerful Congregation, so that she and Matthew can raise their new family in peace.