While on holiday Peter and Debbie befriend Elsa: a lusty, Trump-loving widow from Denver, USA. She’s less than woke but kind of wonderful. They agree to stay in touch – because no one ever really does, do they?

When Elsa invites herself to stay a few months later, they decide to look her up online. Too late, they learn the truth about Elsa Jean Krakowski. Deadly danger has just boarded a flight to London! What began as a casual holiday friendship is suddenly a threat to the lives of their children.

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?