The Unfriend by Steven Moffat

While on holiday, Peter and Debbie befriend Elsa: a lusty Trump-loving widow from Denver, USA. She is 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! But how do you protect all that you love from mortal peril without seeming, well, a bit impolite? Hilarious comic chaos ensues!This amateur production is presented by agreement with Nick Hern Books