Blindingly Good Mice: The first rule of Mousetrap is you don't talk about Mousetrap. Well, not the ending, anyway. Since Agatha Christie's country house murder mystery debuted in 1952 the conceit has been that audiences don't give away the ending " and pretty much everyone this side of Wikipedia has respected the Queen of Crime's wishes.
SOURCE: mytheatremates.com at 09:35AM on October 18, 2016