Dead Men Don't Answer — Charles Ray

Another Al Pennyback mystery. Al is asked by a young woman to find out why her fiance, supposedly dead for six months, answered his phone. As he investigates, a ghost from his past - a military operation gone terribly wrong - comes back looking for revenge. To make matters worse, he discovers that the dead man might actually be alive, and a murderer. The clock is ticking for our intrepid DC private detectivce, known as the Brown Knight.