Cat and his friends are back! The rich, cantankerous, narcissistic, but generous, septuagenarian Cajun, Clarence "Cat" Touchette, helps when his friend, Crosby "Souris" Babineaux finds his son in a coma at the family's marine transportation company. Cat begins probing, discovers unusual business practices by Souris' son, and scrutinizes a sleazy crew aboard a vessel chartered by a mysterious company.
Clarence “Cat” Touchette, an elderly and very rich Cajun farm owner, is acting as campaign advisor for his friend, Simon, who is a candidate for parish sheriff. When Simon is threatened with blackmail, Clarence, with the help of his blind brother-in-law, J.O., and his friend and employee, Tee Man, investigates the threat. Cat resents getting old and irritability invades his personality in dealing with his family, friends, adversaries and associates. The discovery of a stray dog among his cattle affects him in a manner that even he has difficulty understanding.
What would cause two friends to leave Cajun country and go on a foolhardy romp through Colorado? The argumentative Cajun and Tee Man attend the National western stock show in Denver to buy a bull. They craft an impromptu visit to Winter Park ski resort where, coincidently, the blind J.O., is enjoying winter sports with challenged veterans. The raucous bunch celebrates and J.O. cajoles Cat into a snowmobile race, which ends in near-disaster.
An elderly swamp rocker from the 1950s, Ricky Carl engages Mike to find an extortionist who is offering information as to who murdered Carl's daughter, for $150,000. Mike accepts the gig, but becomes caught in a conflict with Carl's granddaughter, June, whose blocked memory of her mother's 20-year-old unsolved murder, has left her mentally challenged. This creates complications in Mike's hunt for the writer of the extortion note.
Mike Delo, a former military investigator, then, an unorthodox homicide detective with the Omaha Police Department, until he is forced to resign and go private, Delo struggles with alcohol abuse and criticism about his relationship with his family, as he attempts to solve a string of brutal murders. During the investigation, he becomes embroiled in covert FBI operations and conflict between competing crime organizations. He moves quickly and adroitly, and finds clues overlooked by police.