Without You is based on the novel, What To Do When Someone Dies by Nicci French. Ellie Manning, who works as a school teacher, is married to accountant Greg, But her plans for a romantic evening are ruined after a couple of police officers show up with news that Greg has been involved in a fatal accident with a female passenger by his side. Ellie finds herself faced with a lot of unanswered questions.
Ellie flees the office scared and anonymously calls for help. Back home, Ellie’s friends are worried about her deception, particularly Gwen whose identity Ellie is using. Ellie feels completely isolated and ends up being taken by surprise after Hugo Livingstone shows up and gives her a firm clue about what happened on the night of Greg’s death.