Green for Danger is a popular 1944 detective novel by British writer Christianna Brand, praised for its clever plot, interesting characters, and wartime hospital setting. It was made into a 1946 film which is regarded by film historians as one of the greatest screen adaptations of a Golden Age mystery novel. (The 2016 BBC Father Brown episode 'The Rod of Asclepius' is also effectively an adaptation of the novel). Source: Wikipedia (en)