Harry is a 40-year-old LAPD detective in the Hollywood Division who lives in a cantilevered house in the Hollywood Hills. Recently demoted from the elite Robbery-Homicide Division, he operates as a persistent investigator who frequently ignores bureaucratic rules to pursue his cases. A Vietnam War veteran who served as a tunnel rat, he struggles with insomnia and claustrophobia resulting from his combat experiences.

Eleanor is an ambitious FBI agent in her early thirties working the WestLand National Bank robbery case. She initially clashes with Harry over jurisdiction and police procedure before they begin to bond over their shared connections to the Vietnam War. She carries deep grief over the loss of her brother, whose military service heavily influenced her decision to join law enforcement.

Rourke is the FBI agent heading the unit investigating the WestLand National Bank robbery. A former army lieutenant who served as military police in Saigon, he coordinates the joint task force while maintaining a tense and dismissive attitude toward local law enforcement.

William is a Vietnam War veteran who served in the same military unit as Harry as a tunnel rat. After returning from the war, he failed to reintegrate into civilian life, struggling with a severe heroin addiction and drifting through the prison system. His mysterious death sets off the primary investigation.

Sharkey is a 17-year-old runaway with dreadlocks who survives on the streets of Hollywood by participating in theft and illicit encounters. He operates a scam targeting older men, using his small build to lure them in before his accomplices rob them. As a witness to the disposal of a body, he becomes a crucial asset to the murder investigation.

Irving is the intimidating Deputy Chief running the LAPD's Internal Affairs Division. Known for his shaved head and distinctively wide jaw, he prioritizes the reputation and insularity of the police department over individual justice. He actively works to remove independent detectives like Harry from the force.

Pierce is a detective working for the LAPD's Internal Affairs Division under Irvin Irving. He and his partner surveil Harry closely, hoping to catch the detective breaking protocol so they can terminate his career. He eager to please his superiors without questioning the ethics of his assignments.

Don is an Internal Affairs detective paired with Pierce Lewis. Mirroring his partner in both appearance and attitude, he spends his time surveilling Harry in an attempt to build a case against him for the department's leadership.

Joel is a crime reporter for the Los Angeles Times who previously wrote a book about one of Harry's old serial killer cases. He maintains a mutually beneficial relationship with law enforcement by trading information for exclusive leads, though his primary focus remains on advancing his own journalistic career.

Jerry is Harry's assigned partner in the Hollywood Division. A well-dressed detective who moonlights as a real estate agent, he prefers to follow standard procedure and avoid departmental friction. Though he often disagrees with his partner's intense investigative approach, he remains a reliable and honest colleague.

Harvey is Harry's commanding officer in the Hollywood Division. He is highly sensitive to the department's image and heavily invested in ensuring the LAPD is not overshadowed by the FBI during joint investigations. An ex-smoker, he frequently loses his temper when subordinates break protocol or light up in his office.

Art is an ex-convict and Vietnam War veteran living in Los Angeles. Having served as military police in Saigon, he is identified by law enforcement as a prime suspect in the elaborate bank robbery due to his specialized tunneling expertise.

Gene is a veteran who served in the Vietnam War and later lived at a local halfway house. Possessing a criminal record that involves prior bank robberies, he operates as one of the primary suspects in the ongoing tunnel heist investigation.

Binh is a former Saigon police captain who emigrated to the United States and now runs an imported goods business in Koreatown. He is identified as the owner of a targeted safe-deposit box, tying his considerable wealth to a broader criminal history.

Tran is a former police captain from Saigon who emigrated to California alongside Binh. He holds significant wealth stored in a Beverly Hills vault, making him a central target in the impending heist operation.

Gordon is a former military colonel who runs Charlie Company, a facility dedicated to helping ex-convict Vietnam War veterans rebuild their lives and secure employment in Southern California.

Mojo is a large, physically imposing man who operates on the streets of Hollywood. He acts as the muscle in a criminal scheme that targets men soliciting street-level encounters, using his size to enforce successful robberies.

Arson operates as part of a small criminal trio preying on vulnerable targets. He follows vehicles and provides necessary backup during the execution of street robberies, exploiting younger bait to trap victims.

Bob is an older State Department employee who serves as an information contact. He assists the investigation by providing classified background files on foreign military figures residing in the United States.