Splintered

Synopsis: Something has been killing live stock in a remote part of North Wales and now it's started attacking humans. Sophie, a teenager with a troubled past, puts herself and her friends at the mercy of this wild beast, when her obsession of the unexplained leads them deep into the Welsh countryside. Looking for evidence within an abandoned building, Sophie witnesses a vicious attack on her friend and then finds herself incarcerated in a locked room. She cannot escape and her only hope is that her friends manage to find her before her captor makes them his latest victim.     Source: RottenTomatoes.com