When two people with no obvious connection receive similar notes and are then killed by targeted bombs in 24 hours, Carter and Lee have little to go on as they scramble to identify the bomber before he strikes again.
When Lee’s sister, Kim, risks her life to tip him off about the Quantou gang trafficking women into Los Angeles, Lee leaves Carter in the dark while he gathers inside information about the gang’s plans to infiltrate the city.
A student's murder prompts Carter and Lee to go undercover as administrators at an elite high school where they learn the victim was really a police officer posing as a student to investigate illegal drugs on campus.
Detectives Carter and Lee hunt an escaped prisoner searching for his estranged wife and daughter who are in witness protection. When the pair goes missing, the Detectives must find how their location was compromised.
Captain Cole enlists the help of Detectives Carter and Lee as she fears the return of a serial killer when a young woman’s recent disappearance at a hotel believed to be haunted mirrors a series of chilling unsolved cases from five years ago.