S1, E2: A grown up Carol demands answers from DI Hain, who now relives that murderous night 15 years ago as the detective in charge of the case. Hain reveals a completely different story and new clues and secrets that the young Carrie did not see. In the present day, Carol persuades Hain to go back to London with her to reinvestigate the crime, but is his account of the past as complete as he claims?