During a drug bust, Los Angeles Police Department patrolmen Dennis Peck and Van Stretch assault a dealer and his girlfriend. Outside, fellow patrolman Dorian Fletcher shoots a man running towards him, only to discover that he was unarmed. While Fletcher is distraught by the incident, Peck plants a knife on the body to get Fletcher off the hook. Soon afterwards, Raymond Avila joins the LAPD's Internal Affairs Division (IAD) and is assigned to investigate the drug bust with partner Amy Wallace.