'The Patient' is an effectively terrifying thriller about ... therapy

A man awakens, lying in a bed. He seems confused, but he finds his glasses on the table next to him and puts them on. Fully dressed, he gets up, but when he takes a step, he hears a clanking sound. He looks down to find he is chained to the floor by his ankle. He is in a rec-room-style basement with dark walls. There's a sliding glass door on one side of the room, but he can't reach it. Small high windows on the other side, but he can't reach those either. When he screams for help, no one answers.

This is the beginning of the 10-episode series , from Joel Fields. The trapped man is Alan Strauss, a therapist, played by Steve Carell. As we soon learn (and as they disclose in the publicity push for the show), he's being held in the home of his patient, Sam Fortner (Domhnall Gleeson). Therapy can be about a lot of things, but Sam has a very specific problem he needs help with: he is a serial killer who wants to stop killing and is finding it very hard.