Regardless of some minor weak points (which every series has) a top-notch supernatural thriller with some timeless messages. I do agree with those who suggest the killing off of main character led ultimately to the show's demise. Who knows. I wish we American viewers had access to the same footage as was originally aired on BBC UK.
I am definitely going to follow the acting careers of the main characters. Particularly Christina Cole (Cassie) and Michael Fassbender (Azazeal).