Slow Horses gets an explosive sister show

In the premiere of Down Cemetery Road, a desperate woman walks into a private investigator's office. “Let me guess,” says the detective, Zoë Boehm (Emma Thompson).

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“You've got a husband. He's got a secretary. Am I warm?” She is not. Neither a film-noir femme fatale nor a jealous housewife, Sarah Trafford (Ruth Wilson) has come for help in solving a mystery that has little to do with her own life. Her initially inexplicable obsession sets the tone for Apple's unusually humane conspiracy thriller.