Turn the Key Softly is a 1951 novel by the British writer John Brophy.Watson & Willison p.539 It follows the lives of three women in the first dozen hours after they are released from prison.
Adaptation In 1953 it was made into a film of the same title directed by Jack Lee and starring Yvonne Mitchell, Joan Collins and Terence Morgan.Goble p.57
References
Bibliography Goble, Alan. The Complete Index to Literary Sources in Film. Walter de Gruyter, 1999. Watson, George & Willison, Ian R. The New Cambridge Bibliography of English Literature, Volume 4. CUP, 1972.