S1, E2: Part two of a three-part thriller. Schoolteacher Ellie Manning is devastated when her husband Greg is killed in a car accident, together with the mysterious Milena Livingstone. Ellie turns up at Milena's workplace using a fake name and offers to help sort through Milena's paperwork on the pretence of being helpful but is really looking for clues as to how she knew Greg. She wastes no time in building a picture of Milena from her schedule and the anecdotes of the office assistant. Hearing of Milena's numerous affairs does little to quell Ellie's fears and her double life begins to take its toll. Milena's business partner Frances Shaw confides in Ellie that her own marriage is over as she had fallen for Milena's lover. When Ellie asks Frances who her lover was, they are interrupted but agree to meet later at the office to talk. However, when Ellie returns - determined to tell Frances who she really is and what she has been doing there - she realises that she is too late.