A werewolf and a vampire, co-workers at a hospital, happen to also be roommates in a house that is haunted by a ghost that only they can see. It's a lot like Three's Company if it was written by Anne Rice.
The first ~dozen episodes are great. You'll sit there watching, trying to figure out where exactly this is all going while very entertained. The story dives into the immortal vampire's past, the newbie werewolf's future and the mystery behind why the ghost is dead and haunting their house. Eventually, like all character-based tv shows, the characters get stale and the plot needs to be changed in order to keep the audience. Just as the writers get back on track, The Hobbit trilogy happens and Aidan (the vampire) leaves the show... because yeah, Peter Jackson and the Hobbit!
With the trio broken up, they reboot the entire cast and you sit there, disappointed but still watching because you need to know how it all ends.
When you finish watching the series (and you will) you will probably come to the conclusion that the second story with the second trio was far better than the first and it was a shame that the writers had to spend so much time easing the audience into the drastic changes before moving ahead. What started out as a quirky little horror-drama turned into a cohesive final 10 or so episodes.
This was a great show under poor circumstances.
And now is the time to warn you against the American version of the show with the same name. Almost 100% of the time, when there is an American adaptation of a UK franchise, it's terrible. That's all I have to say about that.
