When BCPD's police dog, Cookie, sniffs out a stash of heroin in a young girl's backpack, Russ and Milt have competing theories as to where it came from and why she had it. Also, Jacocks travels to Detroit for a training seminar, with the ulterior motive of finding out why Milt was sent to Battle Creek.

After Commander Guziewicz narrowly escapes when her home is burned down, the arson investigation leads Russ and Milt to a variety of suspects, including a string of ex-lovers and her own estranged son. Also, Russ is determined to find out who sent Holly a gift.