Episode 1 (Season 3)

Episode 1 is the first episode of the third season of A Discovery of Witches. It is also the nineteenth episode overall in the series. It also serves as season premiere for A Discovery of Witches Season 3. It premiered on January 7, 2022.

Synopsis
Diana mourns the death of her foster mother, Emily Mather, who was murdered by Peter Knox. When Diana and Matthew learn they are expecting twins, it becomes clear that their family is in danger.

Plot
Diana and Matthew arrive back at Sept-Tours, having travelled back from the past following Diana's completion of her training. They find themselves thrust in the deep end, however, when they are greeted by a dying Emily, who dies in Sarah's arms moments later.

The following day, Matthew and Diana sit in their room. Matthew remarks that he can hear two heartbeats, and it becomes known that the two of them are expecting twins. Meanwhile, Gallowglass returns to Sept-Tours and is greeted by a warm hug from Diana. Diana remarks that it is good to see him, and Gallowglass makes a joke about waiting over five-centuries to see the two of them again. As the de Clermonts gather — accompanied by numerous other allies — Matthew talks about the actions of Peter Knox. Diana remarks that killing him would be too kind and that they must make him pay for taking Emily away from them.

Shortly after, Matthew turns his anger towards Marcus, citing that as Grand Master of the Knights of Lazarus it was his job to ensure Sept-Tours was safe. Both Marcus and Phoebe rebuke him, however, citing that he did not go unchallenged and as a result, Marcus was nearly killed. Matthew simply follows this with the fact that Emily was killed.

Sarah visits the site of Emily's murder and finds that the page she hid from Peter Knox — one of the three pages from the the Book of Life — has revealed itself. She takes this back to the room in which she and Emily were sleeping, and is soon accompanied by Diana. Diana questions why Emily was outside of the walls of Sept-Tours, and Sarah tells her that Emily sought guidance from Rebecca. Diana is astounded, citing that Emily believed anyone practicing such magic was irresponsible, but Sarah is quick to suggest that they do the same and contact Emily. Diana immediately rebukes her, citing that she cannot use her magic to intentionally change the past — the damage done from her trip to London is enough. Moments later she reveals the news that she is having twins.

The Congregation gathers on request from Agatha Wilson, who wishes to discuss an important matter. Before this is possible, however, she is interrupted by Knox, who reveals that the Covenant is being broken at Sept-Tours where witches, demons, and vampires are all cohabiting. Whilst Agatha does not deny the allegations, she is quick to bring attention to the murder of Emily Mather at the hands of Knox. Whilst Knox denies this, citing that she died from overxertion — and citing that Marcus attacked him — Agatha suggests that Knox be removed from the congregation. Baldwin supports this, citing that a witch entering Sept-Tours without invitation is a declaration of war. Satu further agrees and Knox is removed from the Congregation and ordered to never return.

Emily's funeral is held on the grounds of Sept-Tours in a beautiful ceremony. Sarah struggles with the experience but is aided in setting Emily free by Diana. Ysabeau cites that she will not attend due to her history and previous interactions with witches. Afterwards, Sarah hands Diana the Ashmole page, citing that Emily would've never allowed Knox to get his hands on it.

Baldwin returns to Sept-Tours and is immediately put at odds with Matthew. Baldwin remarks that he doesn't agree with Matthew's relationship with Diana, but Matthew reveals that she has been blessed by Philippe himself. This gives Baldwin an upper hand, however, and he remarks that she must now oblige him as the head of the family. He finds himself at further odds after he orders everyone who is not a member of the de Clermont family to eat in another room. Tensions arise when talk of the Covenant being outdated begin, and Baldwin is quick to silence them, remarking that they will withhold Philippe's idea and visions for the Congregation. Further, he orders that all non-members of the de Clermont family must leave Sept-Tours at morning rise.

After the dinner, Diana questions Matthew about "Benjamin", a man who was mentioned at the dinner. Matthew reveals that he sired the man to ensure that he could not link knowledge of vampires to humans without revealing himself. Shortly after, Matthew abandoned Benjamin.

The following day, Marcus suggests to Matthew and the others that they forgo the Covenant and Congregation and strike out on their own, forming a scion. Matthew is ashamed that this would ever be considered, however, and shuts them down immediately as they all prepare to leave Sept-Tours.

Matthew, Diana, and Sarah arrive in London, where they are greeted by Fernando, Matthew's brother Hugh's mate. Inside, Matthew, Sarah, Diana, and Miriam examine the page from the Book of Life. They surmise that if they study the page, they can perhaps find information about the history of blood rage — and a possible cure. Diana suggests that they need a lab to work privately, and she has an idea.

Diana brings Matthew and Miriam to meet a friend of hers, Christopher Roberts. He shows the three his lab and is introduced to photographs of the genetic mark-up of blood rage. He is confused, but is successful in noting that the disease is genetic and something he has not seen before.

Meanwhile, back at the house in London, Fernando and Sarah talk. Sarah is upset that nobody is talking about Emily, but rather focusing too much on blood rage and their scion. Fernando, however, takes the time to explain about Hugh de Clermont, Philippe's son. He tells Sarah that the two were mated for six hundred years but Philippe refused to recognise their union. Fernando too suffered a similar situation to Sarah in which nobody acknowledged his grief and suffering.

Diana tells Christopher of the existence of vampires, witches, and demons, but he is reluctant to believe her. To convince him, she shows him her abilities and this is finally enough to convince him.

Starring

 * Teresa Palmer as Diana Bishop
 * Matthew Goode as Matthew Clairmont
 * Edward Bluemel as Marcus Whitmore
 * Aiysha Hart as Miriam Shephard
 * Alex Kingston as Sarah Bishop
 * Valerie Pettiford as Emily Mather
 * Adelle Leonce as Phoebe Taylor
 * Aisling Loftus as Sophie Norman
 * Steven Cree as Gallowglass de Clermont
 * Peter McDonald as Baldwin Montclair
 * Tanya Moodie as Agatha Wilson
 * Daniel Ezra as Nathaniel Wilson
 * Owen Teale as Peter Knox
 * Lindsay Duncan as Ysabeau de Clermont
 * Malin Buska  as Satu Järvinen
 * Ezekiel Actie as Margaret Wilson

Trivia

 * It is revealed that Matthew is the sire of Benjamin Fuchs, who he abandoned centuries prior.
 * Fernando Gonçalves is introduced, and he tells the story of his history with Hugh de Clermont, his mate and Philippe's eldest son.
 * It is revealed that Hugh has been dead for over seven hundred years.