I started watching the Murdoch Mysteries purely by chance and I am hooked. The plots as good as anything on TV right now, the characters are really quirky, and I love trying to guess where the shoot locations are in Toronto... I suspect High Park, The Don Valley and The Island, although I can't figure out where a lot of the downtown urban scenes are shot.
Also seeing a lot of my actor friends playing bit parts in as well.
The geeky period technology, and the random science fiction thoughts of Constable George Crabtree are totally awesome - the dude often starts out discussing a perfectly plausible idea and then veers of into to bizarre science fiction by the end of the sentence.
The only think that puzzles me is why Detective Murdoch wears guyliner, but maybe that is another Murdoch mystery.
Anyway, worth a look if you haven't seen it yet.