Masterpiece Mystery!: Poirot: Third Girl

Thursday, September 27 at 9:00 p.m.

Norma Restarick (Jemima Rooper), a young and tormented heiress, visits Hercule Poirot (David Suchet) with an alarming cry — "I thought you might be able to save me!" She thinks she may have committed a murder, but before Poirot can inquire further, she's gone.

Soon thereafter, Poirot and his fiction-writer friend Ariadne Oliver (Zoe Wanamaker) learn of a death — Norma's childhood nanny, apparently a suicide. But Norma, haunted by memories of her childhood and her own mother's suicide, is convinced she's committed the heinous crime.

Norma's family and circle of friends fear for her sanity. But as Poirot delves into this compelling case and Norma's tragic past, he begins to fear for her life. Norma may be in imminent danger, but can Poirot devise a plot to lure a killer and save the fragile Norma? Based on the novel by Agatha Christie, Third Girl.