Dunno if this qualifies as a spoiler, so:
And regarding the finale itself:
Prior to the finale CTV aired a retrospective with the cast, and it was intriguing to see how personal this show was to them. They really were a family offscreen and on, and it showed. Enrico Colantoni mentions that the effect the show has had on police is immense - he'd be having coffee somewhere, and cops just walk up and flash their badge, simply saying "Thank you" - and that's great. Episodic as it is, this show does go a long way to show the consequences of police having to witness incredible acts of violence on a regular basis and how it affects them and their families. Bravo to 'em, Flashpoint will be missed.