The Forest

An American woman, Sara (played by Natalie Dormer of Game of Thrones and The Hunger Games), journeys to the forest in search of her twin sister Jess (also played by Ms. Dormer), who has mysteriously disappeared. Frustrated at Jess' pattern of behavior, Sara's husband Rob (Eoin Macken of The Night Shift) is unable to talk his wife out of making the 6,000-mile trip. After a visit to the school where Jess teaches, the resourceful Sara sets out for the forest itself. Accompanied by a charismatic new acquaintance, expatriate journalist Aiden (Taylor Kinney of Chicago Fire), she enters the forest having been well warned to "stay on the path." Forest guide Michi (Japanese star Yukiyoshi Ozawa) keeps a protective eye on them both, but when night falls he cannot dissuade them from staying in the forest, and reluctantly leaves the duo to face the elements alone. 
Fear soon fragments Sara's consciousness; she begins to question Aiden's motives, including his claim that he has never seen Jess. Determined to discover the truth about her sister's fate, Sara will have to face the angry and tormented souls of the dead that prey on anyone who dares come near them. These malevolent spirits lying in wait for Sara at every turn will plunge her into a frightening darkness from which she must fight to save herself. (official distributor synopsis)