The Unfriend

The Unfriend is a comedy play by Steven Moffat about a middle-aged English couple, Peter and Debbie, who befriend a friendly American woman named Elsa on vacation. They promise to stay in touch out of politeness but are horrified when she unexpectedly shows up at their suburban home a few months later.

The synopsis revolves around their attempts to get rid of their unwanted, unsettling guest while struggling with the social obligation and politeness that prevents them from simply asking her to leave