一具具青春女体以极其诡异的状态出现在人迹罕至、浓密幽暗的森林里，潜藏的是超自然的神秘力量，还是令人发指的邪恶意图？西班牙巴斯克省的比利牛斯山区，这里丛林幽密、拥有古老的历史和民间传说，连语言都跟西班牙语和法语截然不同，堪称遗世独立的神秘所在。聪慧坚毅的女警探阿麦亚•萨拉沙奉命调查两起命案，死者都是妙龄少女，她们皆被细绳绞死，全身赤裸，倒卧在河边，且下体放了一块传统的巴斯克蛋糕。为了这两起起命案，萨拉沙警探被迫重回她多年来试图逃离的家乡。她与母亲、姐姐的关系向来紧张。如今镇上人人自危、左邻右舍都是嫌疑犯，而胶着的案情更是让人充满无力感，因为凶手是不等人的……眼看诡谲的凶案接连发生，迷信的镇民开始谣传此乃神秘生物巴萨璜所为。但是萨拉沙相信这一定是出自人类之手，只是真相比她想象得还要可怕，而且离她更近。她多年来总是恶梦缠身，屡屡梦见自己遭人追杀，这究竟源于怎样的儿时创伤，如幽魂一般纠缠至今？巴斯克浓密的幽暗森林里，潜藏的是超自然的神秘力量，还是令人发指的邪恶意图？……(Many young female bodies appeared in the pathless, thick and dark forest in an extremely strange state. Was supernatural mysterious power or heinous evil intention hiding there? In Pyrenees Mountains of Basque Country, Spain, there is thick forest, long history and folklore. Even the language is entirely different from Spanish and French. It is really a mysterious place which remains aloof from the world. Amaia Salazar, an intelligent and determined female agent, was ordered to investigate two murders. The dead were both young girls. They were both hanged with strings and found naked and lying down on a riverbank with Gateau Basque in their private parts. For the two murders, Salazar was forced to return to the hometown she always sought to escape for years. She had strained relations with her mother and her elder sister all along. At present, everyone in the town felt himself imperiled. Any neighbor may be the suspect. The sticky details of the case also made people full of powerlessness because the murderer would not wait. Seeing the treacherous murders occurred successively, superstitious townees started a rumor that the murders were committed by a mythical creature known as the Basajaun. However, Salazar believed the murders must be committed by a human. However, the truth was more terrible than what she had imagined and became closer to her. She had been haunted by nightmares for years and repeatedly dreamed of being hunted down. What kind of childhood trauma had haunted her so far like a ghost? Was supernatural mysterious power or heinous evil intention hiding in the thick and dark forest in Basque? ...)