Portrait in Murder and Gay Colors

From an Amazon.com reviewer:

H. Paul Jeffers is another VERY under rated American novelist. A body is found in a NY apartment bludgeoned to death. In his bedroom is a naked portrait. The portrait is of a well known gay "Call Boy". An address book leads the two straight detectives into the gay NYC bar scene, involving high officials and well known persons. The main detective Sheldon becomes fascinated with the case. The description of the detective's thoughts and actions draw the reader into the detective's character. This is a fascinating read that made me wonder why I had never heard of this book before.