The mousetrap is famous around the world for being the longest running show of any kind in the history of british theatre the scene is set when a group of people gathered in a country house cut off by the snow discover to their horror that there is a murderer in their midst who can it be one by one the suspicious characters reveal their sordid pasts until at the last nerve shredding moment the identity and the motive are finally revealed in her own inimitable style dame agatha christi