Blood in the Water has Miami-Dade Homicide Detective Max Hahn assigned to a new case in the waters of Biscayne Bay. His two victims were found murdered in one of the few remaining shacks in an area known as Stiltsville. He coordinates the investigation, which yields a few pieces of evidence, but nothing that points to the killers. Before leaving the scene, one of Hahn's team members spots something, a gold coin, in the water below the dock. He's unsure if it's related to the case, but it could provide a possible motive. By following the leads, Hahn locates and arrests one of the killers but is unable to find the other. He also struggles to explain a piece of evidence recovered from the scene. Through a series of events and good police work, Hahn figures out the last clue and solves the mystery.