Agatha Christie created a radio play called "Three Blind Mice" in 1947 to celebrate Queen Mary's birthday, which originated from a 1945 case involving a boy's death in foster care. Christie adapted the radio play into a stage play called "The Mousetrap", which opened in London in 1952 and has been running continuously since, setting a world record as the longest continuous run. Christie's contract for "The Mousetrap" stipulates it cannot be made into a film until it has closed for at least six months, and it has been running for over 50 years.

1. The Mousetrap Agatha Christie