Domhnall Gleeson has to do a balancing act for the new limited TV series he stars in — delve into the psyche of a serial killer without justifying his behavior. The Irish actor stars as Sam Fortner, a murderer who chains his therapist to the floor in his basement in THE PATIENT an introspective psychological thriller now on Hulu. Sam has just one request of Dr. Alan Strauss, played by Steve Carell: Help me stop murdering people.