The show may come across as plodding to people expecting an action series with a Hannibal Lector-like serial killer, but the show is a character-driven drama featuring a cast of flawed people very reminiscent of "Nordic Noir" shows such as "Wallander", but very unapologetic Canadian very with very good sense of place. Algonquin Bay on the show, and in the original novels, is quite clearly North Bay, Ontario in all but name (many of the same street names, located between the same lakes, and geographically in the same location), and the show, as with the novels, touches on the mix of English, French, and First Nations groups that form the culture of the area. And anyone who has lived in communities in northern Canada can sympathize with water lines freezing.
Billy Campbell does good work playing the troubled, but very good detective Cardinal, while Karinne Vanasse plays his partner Lise Delorme --also from the novels, lest people think they were casting a French-Canadian actress simply as a token--as equally competent, if not as experienced. The dynamic between is certainly not a copy of the Holmes-Watson relationship that people might be tempted to assume it is, and the pair do a very good job of portraying a detective paired up with a partner who is just as good as he is.
Overall, a very engrossing series again, as long as you aren't expecting shootouts or a serial killer leaving taunting clues.