A Coffin From Hong Kong — James Hadley Chase

It was the easiest 3,000 Nelson Ryan had ever made - but suddenly he realised he was being played for a sucker. A telephone call, seemingly innocent enough, led him to the murder of a Chinese call-girl who talked too much. It also pitched him straight into the teeming, sordid night life of colourful Hong Kong. From now on, Ryan would stick at nothing to get the killer who'd crossed him up.