John Dickson Carr (1906 - 1977) was a prolific American author of detective stories who also published under the pennames Carter Dickson and Carr Dickson. He was a master of the locked room mystery, in which the deaths of his victims seem impossible for some reason, such as being in a locked room, or dead on a sandy beach with no footprints but those of the victim.
He also wrote radio and film scripts: His 1943 half-hour radio play Cabin B-13 was expanded into a series on CBS in the early 1950s, and he wrote all those scripts. That radio play was also expanded into the script for the 1953 film Dangerous Crossing, directed by Joseph M. Newman and starring Michael Rennie and Jeanne Crain.
With Adrian Conan Doyle, the youngest son of Sir Arthur Conan Doyle, Carr wrote the Sherlock Holmes stories that were published in the 1999 collection The Exploits of Sherlock Holmes {ISBN 0157203383}.