The Deep Blue Good By by John D. MacDonald

In this classic detective novel, we follow a rugged, self-proclaimed "salvage consultant" who lives aboard a houseboat in Florida. He is drawn into a case involving a treasure hidden by a soldier during World War II, which has become the target of a manipulative and sadistic man. As the protagonist uses his charm and wits to track down the treasure and protect the soldier's innocent daughter, he navigates a dangerous path filled with deceit, violence, and betrayal, showcasing his unique moral code and his willingness to confront the darker aspects of human nature. The 12174th greatest book of all time