A group of field trip students and a teacher discover a woman's dead body at the beach. Two Los Angeles Police Department detectives, Phil Gaines and Louis Belgrave, are assigned to the homicide investigation. The case appears to be a suicide but things do not add up. The deceased, Gloria Hollinger, overdosed, yet the trail leads back to Leo Sellers, a wealthy and corrupt attorney. Gaines and Belgrave do not believe Gloria's death to be suicide based on information from Gaines' girlfriend, Nicole, a call girl. But they cannot close the case. Along the way, the detectives learn that Marty, Gloria's father and a headstrong veteran of the Korean War, did not believe the official report either and attempts to solve the case himself. He goes after Sellers and learns that Sellers was responsible for his daughter's death. Gaines and Belgrave track Marty to Sellers' mansion where they find Marty has just killed Sellers. Gaines stages it to look like self-defense, letting Marty off the hook for the crime. Gaines calls Nicole to reconcile, and they plan a trip to Rome. On his way to the airport, he stops in a convenience store and walks into the middle of an armed robbery. He trades fire with the assailant but is killed in the exchange. Belgrave goes to the airport terminal to inform Nicole, and without a word, she realizes that Gaines is gone.
