If you come to see a creature feature and gore, don't watch this film.
If you come for atmosphere and an utterly human experience of the unknowable, this is just the movie for you!
The Block Island Sound is slow paced and set inside a family with already strained relationships. They are beset by something out of the pages of Lovecraft. This film beautifully dealt with its mystery so that even at the end, I'm not convinced I know what really happened.
From the start of the film, we are thrown into sound, which gets more unsettling as it doesn't relent. Almost every scene is seeped in some or other background noise which has the effect of de-realising the whole experience.
I was pleasantly surprised by Chris Sheffield's acting since I only knew him from playing smaller roles. There were a few scenes where I couldn't tell if he was trying too hard, since there was such a sincerity to it that I could wholly believe it was the character not the actor.
I can imagine that many people would loathe this film because of it's slow pace, its focus on the characters' relationships and the ending, which is unfulfilling at first glance. I, however, was fully transported onto Block Island and its Sound.