Kate discovers evidence that suggests her late husband David may have been a serial killer. While reading condolence cards, Kate finds a letter addressed to David containing information about missing girls and a mind map linking to other cases. After hanging up on a friend who is comforting her about David's death, Kate searches David's office and finds photographs, hair, and a list of names. By searching these names online, Kate finds articles about missing persons and cases of foul play. Kate has a panicked phone call with her friend Jane where she explains what she has found and is unsure of what to do with this disturbing new information about her husband.