S1, E3: Conclusion of a three-part thriller based on a novel by Nicci French. When her husband Greg is killed in a car accident along with a woman named Milena, Ellie Manning decides to find out what really happened. A shocking discovery at an office forces her to flee and, feeling isolated and alone, she is taken by surprise when Milena's husband turns up and offers her a firm clue as to what happened on the night of Greg's death. Having risked everything and with nothing left to lose, Ellie is determined to get to the truth, whatever the cost to her personally.