At first this show seems to be about the supernatural VS mental illness, with the main character struggling to determine whether she's just hullucinating or not.

As the story progresses, a new element is brought in: group thinking, cults, and mass hysteria.

Although the show was pretty interesting, the ending was unfortunately the most boring and inconclusive endings I've seen to such an exciting show.

I'm sure this show would be very good if you are into: aliens, psychological disorders, infiltrating cult-like organisations, plotting & scheming, philosophy, and the question "Is faith more powerful than truth?".