The Man Who Understood Cats — Michael Allen Dymmoch

Jack Caleb is a Gold Coast psychiatrist, wealthy, cultured - and gay. John Thinnes is a burned out Chicago detective. When one of Caleb's clients is found dead in his locked apartment -- apparently of a self-inflicted head wound, Thinnes doesn't believe it was suicide. And Caleb is inclined to agree.

But Thinnes regards a shrink who makes house calls suspicious and starts his investigation of the murder with the doctor himself. An attack on Dr. Caleb, made to look like an accidental drug overdose, starts to change the detective's mind.

The investigation subsequently turns up art thefts, real estate swindles, and blackmail. Ultimately the two men are forced to work together, to confront the killer and come to an understanding that changes them both.