Do you know that movie about a haunted house? “Which one?” you ask? Exactly. Here we have one of those.
You can make a good shot about the story. A family moves onto a big, remote house and soon gets haunted by the inhuman inhabitants. There we have the first half of “The Conjuring”. The story is predictable, but the atmosphere is well enough. Halfway, the family calls in two ghost-busters whose story is intwined with the main story. The ghost-busters move in with the family as they try to get rid of the demonic spirit.
I am not sure how “The Conjuring” ended up on my to-see-list, but lest you should like the predictable kind of horror, it need not be on yours.