Before it opened, Agatha Christie gave the rights to The Mousetrap to her nine year old grandson, Mathew Prichard, without any idea that it would become a huge record breaking phenomenon. The Mousetrap opened on 25th November 1952, produced by Peter Saunders. Richard Attenborough and his fellow film star and beloved wife Sheila Sim played the leading roles as Detective Sergeant Trotter and Mollie Ralston. The late Deryck Guyler provided the pre-recorded voice of the newsreader in the first act and the same recording is still used today. In 1994 Sir Stephen Waley-Cohen became the producer of The Mousetrap.