Donald MacKenzie 
Salute from a Dead Man 

Ritchie Duncan, a convict, is released from prison and decides to go clean. But when he is handed some top secret film containing electronic data by a girl in a bar there ensues mayhem and murder. The film is the property of her communist agent boyfriend, and when she refuses to surrender it her connection is killed and she is kept quietly alive in a nursing home until Duncan can save her. 'Donald Mac Kenzie is a born storyteller’ Guardian