Hmmm.... If a film has Jim Carter, Elijah Wood, Burn Gorman, and Anna Massey in it, it should, by all means, be very good. It was interesting for the most part, but not their best work. I find the language and nudity to be a turn-off and a distraction from the mystery of this movie.
To be honest, I've found other mystery/thrillers to be better than this. I think the writers and producers tried, but it could have been better. The fault certainly doesn't lie with the actors/actresses. I've seen their work in other roles before and I know they all very good at their jobs. It might even be fair to say that the roles were not playing up to their strengths.
I will look forward to other movies with these actors and actresses, but this film was a bit of a disappointment.