The Unfriend A CADOS Production Written by Steven Moffat Directed by Ian Robinson Guess whos coming to murder? British couple Peter and Debbie befriend Elsa while on a cruise. Shes a lusty, Trump-loving widow from Denver - less than woke, but kind of wonderful. They agree to stay in touch because no-one ever really does, do they? A few months later Elsa invites herself to stay with the family in London. Looking her up, they discover her dangerous past, with a string of mysteriously deceased husbands and the police on her tail. But its too late - the deadly danger is already flying to England! What began as a casual holiday friendship is suddenly a threat to all their lives. Peter and Debbie now face the ultimate challenge of the modern world - how do you protect all that you love from mortal peril without seeming a bit impolite? A comedy from the writer of Sherlock, Doctor Who and Coupling.