Myfanwy Thomas is thrown into the world of the Checquy, a paranormal secret service.
Monica discovers a dark truth about one of the victims; One of Myfanwy's dead attackers disappears from the morgue.
Myfanwy discovers a disturbing clue to her past; Farrier searches for a scapegoat for the bankside murders.
While Myfanwy uncovers a twisted relationship with her psychiatrist, Monica and Gestalt scour London for a missing EVA.
Gestalt’s suspicions of Myfanwy lead to a confrontation; Farrier is suspended, only to seek powerful revenge.
Myfanwy returns to her childhood home; Farrier faces consequences at the Checquy.
After a terrifying prophecy, Myfanwy’s desperation leads her to place her trust in a powerful enemy.
Myfanwy and Farrier discover how dangerous life is outside of the Checquy; Grantchester runs out of options.