Really an interesting horror film with good scary moments. To content of the story I will tell nothing, best you do not look at even the trailer. What I can say is that the story is very exciting and captivating the audience.
For me personally, the style of the film is crucial, be it cut, quality drama, effects, or closed and logical in itself story building. All this is in the movie very well done, and I think the 5-stars are deserved here.
More movie recommendations from the same genre -> Insidious 1 & 2, The Conjuring, Sinister, The Woman in Black, Orphan, Case 39
Enjoy shudder :)