A familiar face returns and brings a fun, new piece of technology with her...the polygraph. Nathan freezes when a playful line of questioning catches him off guard.
Elizabeth receives a sentimental surprise in time for Little Jack's first day of school. Nathan trains a new Mountie cadet. Rosemary and Lee make a landmark decision.
Elizabeth and Nathan's date night unexpectedly leads to an undercover operation at a glamorous party. Lucas and Edie grow closer over cards. Rosemary holds auditions for a play.
