I am giving this 1 star purely down to Maisie William's acting, everything else was a bust. From the rat tailed young Boycey to the annoying 'Teddy' the characters are ridiculous. The only one actually tolerable and who actually acts like someone would in this situation is Maisie Williams.
There is no 'psychological thriller' about it, infact the plot is in title. This could of had the makings of a good movie but the lack of story, explanation, flow and anything that resembles a scare or making you think just takes away any kind of hope for this movie.