Secrets of Death by Stephen Booth

This is another Ben Cooper and Diane Fry novel. 

The body of Roger Farrell is found in his car in a car park in the peak district.  He has obviously committed suicide.  DI Ben Cooper finds a card in the car with the words 'Secrets of Death'.  

DI Cooper begins to investigate if there is a link between a number of suicides in the area.  There is a concern that there may be negative press in the area as a place for 'suicide tourism'.  Within the investigations he interviews one person, Anson Tate, who was saved from his own act of suicide by a passing tourist.  If he can get Mr Tate to talk and tell him about the 'secrets of death' he may be able to stop further suicide attempts taking place.  

In another division, at the same time, DS Diane Fry is investigating Roger Farrell and when he is found to be dead Cooper and Fry share information to help both of their investigations.