15 Division goes undercover at a bar that is supplying illegal firearms.
Andy worries Duncan may not be suited to the job; Gail makes a harrowing discovery.
Before Fite Nite, the officers have to seize all proceeds from crime.
Oliver is promoted to Acting Staff Sergeant; a new rookie, Duncan Moore, joins the force.
Andy and Dov become involved in a holdup at a diner; Nick searches for Sam Swarek's next of kin.