Source of plots
Crime films are often based on real events or are adaptations of plays or novels. For example, the 1957 film version of Witness for the Prosecution is an adaptation of a 1953 stage play of that name, which is in turn based on Agatha Christie's short story, originally published in 1933. The film version was remade in 1982, and there have been other adaptations. However, each of these media has its own advantages and limitations, which in the case of cinema is the time constraint.