I think Mark Gatiss has hit his stride with this adaptation. Whilst The Tractate Middoth and The Dead Room were both good, this production is spot on; perfect writing, casting, location, photography, directing and editing. Not as deliberately scary as, for example, Lawrence Gordon Clark's A Warning To The Curious, nevertheless its sense of human horror as worse than ghostly horror leaves a chilling impression. Here's hoping Mr Gatiss is willing and able to deliver many more such.