The two move into the ground floor flat at 10 Rillington Place in London, and it is from there that John Christie begins to explore his deep dark side.
When newlyweds Tim (Nico Mirallegro) and Beryl (Jodie Comer of The White Princess) move into the upstairs flat, the Christies face some complications quite close to home.
Rillington Place kicks off in the 1940s and introduces viewers to Ethel (Samantha Morton of Fantastic Beasts and Where to Find Them) and John Christie (Tim Roth of Reservoir Dogs and Twin Peaks), who reconciled after many years of separation, and it becomes clear quite quickly that something changed in John during their time apart.