In his probe into the killing of an off-duty cop in Chinatown, Kelly reluctantly accepts the cooperation of a Chinese gangleader and briefly annoys Det. Harold Ng (Tzi Ma). Andy is enraged when the beaten wife from the season premiere turns up dead. A new cop named Adrienne Lesniak arrives at the 15th and he briefly clashes with her over the case before they are able to work together to get a confession in the case. The other cops learn Adrienne has an ex-boyfriend who's a mean-spirited and jealous type.