The nightmarish tale of two siblings cruelly separated as kids. The youngest, Elena, is confined to the world of darkness, where she leads a miserable life. While the eldest, Facundo, remains in paradise, where he lives a peaceful life as a doctor with his wife and two daughters. 25 years later, the two are reunited to face the family tragedy that separated them.

　　本片讲述一位曾精神受创的女子莫莉，在接受了一年多的治疗后终于出院了。为了开始新的生活，她搬到了新的公寓里。某天她听到了楼上传来了神秘的敲击声，而楼上的人却称没有听到任何声音。伴随着敲击声的次数越来越多，莫莉越发感觉到是有人在求救，但周围的人却认为她又发病了，莫莉也渐渐地歇斯底里了。这一切究竟是她的幻觉还是真实发生的呢？

　　During building work in the city of Baden-Baden in 2015, an evil troll who was transformed into stone in the 15th century, is accidentally brought back to life. To prevent being unmasked, the Troll slips into the body of Vanessa Majer and enslaves. Meanwhile, Vanessa Troll is looking for Charlie, the virgin boyfriend of Vanessa's daughter. The Troll needs his blood to evoke a portal to a magical prison. All he needs now is a the great book of spells which he wants to find with the help of the ominous King of the Lake. Vanessa Troll's plans prove to be successful if it wasn't for the author, Dr. Fischer, and the curious neighbor, Béatrice, who eventually come after him.