San Jose police officer Grace Travis is undercover with the Oakland PD.In her undercover persona as Jackie Hays she had been setting up a drug deal with gangster Jimmy Laszlo but is pulled out of her current operation when her son Sam killed in a drive-by shooting. Four months later, she is still on leave and trying to find her boy's killer. She's looking at her old cases to see if someone might be seeking revenge but after gangster Jimmy Laszlo's accountant, Tony Alden, is killed, the forensic reports find the same type of blended metal in the bullets that killed him as were used to kill her son. They also found hoisin sauce. She is shot in a drive-by attempt on Laszlo and again, there's a similarity in the bullets. Grace gets the license plate of the car and gives it too her less than reliable colleague, Wilson. Her cover is soon blown.