S2·E16 Interior Loft

A woman decides to take up a side job in the phone sex business, for her husband. Disaster strikes when an unknown psychopath becomes obsessed with Kim and starts murdering women for her. The confrontation occurs in the loft. The second half of the episode is about Kim, who is recovering from the attack. She starts to mentally unhinge and her husband becomes gradually more worried that his wife is plotting to kill him.