1937 The Yellow Iris
(Based on the short story of the same name)1947 Three Blind Mice
(Christie's celebrated stage play The Mousetrap was based on this radio play)1948 Butter In a Lordly Dish
1954 Personal Call
Television Plays
1937 Wasp's Nest
(Based on the short story of the same name)Radio Serials (co-authored)
1930 Behind The Screen
. A radio serial written together with Hugh Walpole, Dorothy L. Sayers, Anthony Berkeley, E. C. Bentley and Ronald Knox of the Detection Club. Published in book form in 1983 in The Scoop and Behind The Screen.1931 The Scoop
. A radio serial written together with Dorothy L. Sayers, E. C. Bentley, Anthony Berkeley, Freeman Wills Crofts and Clemence Dane of the Detection Club. Published in book form in 1983 in The Scoop and Behind The Screen.1931 The Floating Admiral
. A book written together with G. K. Chesterton, Dorothy L. Sayers and certain other members of the Detection Club.1956 Towards Zero
(A West End theatre dramatization of her 1944 novel co-written with Gerard Verner)