The sniper chooses his victims at random, killing with the cold skill of a pro. Detective Sgt. Ryker is going after him—in a deadly battle only one will survive! Jack Cannon is a pseudonym for Nelson DeMille, author of The Charm School, who published the Jack Ryker series in 1974 and 1975.

A man in monk's robes, The Hammer of God, is butchering women to cleanse the world of witches. Sergeant Joe Ryker is committing every sin in the book to purge New York of killers.

The Smack Man is the fourth of Nelson DeMille's novels about NYPD Sergeant Joe Ryker. It was first published in 1975 with the protagonist originally as Joe Keller. Then republished in 1989 with the author listed as Jack Cannon. The novel focuses on Joe Ryker's attempt to stop a murderer from poisoning illegal drugs coming into New York City.

Nothing surprises Sgt. Joe Ryker. Not corpses, crimes, nor sin of any kind. But when a beautiful New York call girl personally persuades him to investigate a missing persons report and a severed arm comes bobbing up in the East River, Ryker is in for a surprise.

Jorgenson is a smooth-talking CIA agent investigating the murder of one of his own. The victim's body bore the markings of a killer skilled in exotic torture. Ryker's on the case, too—and discovers a world of double-dealing spies and cold-blooded CIA hit men.

Book by Jack Cannon, Nelson DeMille