She filmed the three-part television crime drama "Rillington Place" (also 2016), based on the case of serial killer John Christie, who murdered several women in London during 1940s and early 1950s. Morton was cast opposite Tim Roth as Christie's wife, Ethel. Intrigued by their relationship, Morton felt the depiction of the "psychological aspect of love" in the story "really developed acting chops" but considered as a challenge "to play someone so submissive" as Ethel. The miniseries premiered in BBC One and was favourably received by critics. "The Guardian" found Morton to be "strong" in her "difficult role", and "The Independent" remarked that she "gave a fine, nuanced performance" as "a woman trapped under her husband's spell".