Slam the Big Door — John D. MacDonald

When Mike Rodenska, a former journalist and recent widower, visits his old friend Troy Jamison in Florida, he's shocked at what he finds. For despite the parties, the shapely women, the devil-may-care air that surrounds Troy and his friends, Mike can see a life slowly coming apart. The only question is: why?

Putting together the pieces of his friend's life - and downfall - turns an ordinary visit into a mystery that Mike Rodenska is compelled to solve ...