They Never Say When

They Never Say When is a 1944 thriller novel by the British writer Peter Cheyney.^[1] It is the sixth in his series of novels featuring the London private detective Slim Callaghan, a British version of the increasingly popular hardboiled American detectives.

They Never Say When

First edition
Author	Peter Cheyney
Language	English
Series	Slim Callaghan
Genre	Thriller
Publisher	William Collins, Sons
Publication date	1944
Publication place	United Kingdom
Media type	Print
Preceded by	Sorry You've Been Troubled
Followed by	Uneasy Terms

Synopsis

Callaghan is hired by a Mrs Paula Denys who claims that she paid a to steal a priceless coronet from her husband's safe. Now he refuses to hand over the stolen and is instead trying to blackmail her.