The Blackmail Murders

John Mariner's wealthiest client, Nathan Livingston, retains John and his retired Houston PD detective friend, Larry Wagner, to identify the killer of his blackmailer, Colton Weber, and retrieve and destroy incriminating photos showing him with other women in an intimate setting. As they track down the killer and the photos, Weber's sister, Denise, one of the women in the incriminating pictures, dies of an overdose. That sets off a scramble for the pictures and a more intense pursuit of the killer, while Mariner gets diverted with local issues. As the facts slowly emerge, two more murders connected with Colton Weber turn up. The State Troopers get involved to solve the murders, but John himself becomes the target of the killer as he and Larry seek to discover the killer. After enlisting the FBI as well in unveiling the murderer, those involved in the blackmails and the murders emerge, but not without almost killing Mariner.