While looking for Smitty's killer, Muldoon and Bullman find themselves in the line of fire. Deirdre and Sean realize they are not on the same page, and Duffy and Barbara have a fun drunken night out. Sgt. Mike invites Patton out to visit him in order to gain some traction with the Mr. O murder investigation. O'Bannon is put to the test when Muldoon includes him in a dangerous pursuit.