在这部瘦长怪人：黑暗灵魂恐怖片中,森林中专门吞噬人类灵魂的瘦长怪人杀害了男主角的妹妹，她的灵魂成为瘦长怪人的帮凶。男主角在其他人的帮助下最终杀死瘦长怪人，但他妹妹灵魂却成为森林中最强大的恶灵。
Sarah Lewis mysteriously disapperead in the woods. Her brother William is still traumatized. Two years later, a lot of strange phenomenons will push the young man to go back to the forrest in order to find his sister again. Worried, one of William's friends, Inspector June investigates. She'll take with her the crazy demonologist Thomas Van Ghill. William, his friends and everybody will soon be confronted to a mysterious creature : the Slenderman... Is there a link between the Slenderman and Sarah Lewis ?
