Posing as a security guard, J.C. attempts to infiltrate a precious metals crime ring; Capt. O'Byrne threatens Cooper's marriage.
Nina tries to win the affections of a Chinese hit-man believed to be involved in a quadruple murder in an uptown restaurant.
McNamara investigates possible links to the Chinese mob and his father's murder; Torres asks his sister for a loan to buy a ring for Nina.
