Blue Streak (1999)

Jewel thief Miles Logan and his crew—best friend Eddie, getaway driver Tulley, and new recruit Deacon—steal a $17 million diamond during a heist in Los Angeles. During the escape, Deacon betrays the crew, killing Eddie and trying to take the diamond for himself. Miles hides the diamond inside the air ducts of a building under construction before being arrested. Two years later, Miles is released from prison and tries to reconnect with his girlfriend Janiece, who ends their relationship after learning the truth about his past. Determined to retrieve the diamond, Miles discovers the building where he hid it is now a LAPD station. He disguises himself as a pizza deliveryman, steals an access card, and visits his forger uncle, Lou, who helps him create fake police credentials. Assuming the identity of Detective Malone, Miles is mistakenly assigned to the Robbery/Homicide division. While trying to access the ducts, Miles accidentally foils a prisoner escape, gaining praise and a new partner, Detective Carlson. Miles begins working cases while continuing his secret search for the diamond. On their first case, Miles quickly uncovers a staged burglary. On the way back, he and Carlson stumble upon an armed robbery committed by Tulley. Miles arrests him but is then blackmailed by Tulley for $50,000 to keep quiet about Miles's true identity. Miles claims to be working undercover for Internal Affairs to keep Carlson's trust. Soon after, the team intercepts a heroin shipment. Miles locates the diamond but accidentally drops it into a bag of seized heroin. When the FBI requests the heroin, Miles suggests using it in a sting operation. He volunteers to deliver the heroin as bait and secretly frees Tulley to help. However, Deacon also shows up at the drug deal and exposes Miles as a cop. As tensions rise, the LAPD and FBI raid the operation. Deacon escapes with the diamond in an armored truck and heads for the Mexican border. U.S. agents are forced to halt pursuit at the border, but Miles steals a patrol car and follows Deacon into Mexico. He causes Deacon to crash and offers him a deal: hand over the diamond in exchange for a share. Once Miles has the diamond, he double-crosses Deacon, handcuffing him for the Federales. When Deacon tries to shoot him, Miles kills him, avenging Eddie's death. Miles returns to the border, where the LAPD and FBI demand answers. He claims to be an undercover Mexican officer reporting back to his superiors. Just before crossing, Carlson and Hardcastle stop him. Aware of his true identity but grateful for his help, they let Miles go, and he crosses into Mexico with the diamond, leaving his former life behind.