The Clarendon Players present - The Unfriend by Steven Moffat

The Unfriend - Is a hilarious and satirical look at middle-class England's disastrous instinct to always appear nice, to be polite.
Peter and Debbie are enjoying a cruise - a celebration of 20 years of marriage, and a break from their teenagers. They befriend a fellow passenger, a fun, loud American widow with a fondness for Donald Trump and, even though there's something slightly unsettling about the eagerly friendly Elsa Jean Krakowski, they all agree to keep in touch. A few months later when Elsa invites herself to stay Debbie looks her up online and turns up some hair-raising evidence - but it's too late as Elsa arrives unexpectedly! Just who have they invited into their home?