Renko gets put out when a Division homicide detective ridicules his efforts to learn who killed a 15-year-old prostitute; Furillo learns that he may be in line for a promotion to commander; LaRue and Washington have a surprise for Hunter during his annual alligator hunt in the city sewers; and Fay asks Furillo's help with an obscene phone caller.

Furillo pushes the investigation of Councilman McCauley; LaRue's business dream comes to a bitter end; Lt. Hunter gets his chance to test out an "urban tank" in Sniper Alley.