de marney wrote the play, "wanted for murder" in 1946 which was made into a film, and was also known as "a voice in the night". with percy robinson he wrote the stage thrillers "the whispering gallery", "wanted for murder" and "the crime of margaret foley"; he collaborated with ralph stock to write "search". he co-wrote the screenplay for "no way back" (1949), in which he starred, with the director stefan osiecki.