Capt. Raydor (special guest Mary McDonnell) accompanies Brenda on an investigation involving the disappearance of a nanny working for close friends of the mayor. Meanwhile, Raydor’s real purpose in taking part in the investigation could have big career implications for Brenda.

While investigating a suspicious suicide, the squad wades into a nasty child-custody dispute between a dying man and his meth-addicted ex-wife. Meanwhile, Pope applies for the police chief job, but Brenda might have something to say about whether or not he gets it.

At the request of Detective Mikki Mendoza, the squad becomes involved in investigating a series of brutal murders that indicate a Mexican drug cartel may have moved into the city.