本片是《从地心窜出》系列的前传，前三集中肆虐人间的巨型怪物最早出现在此，位于内华达的一座盛产银矿的小镇，由于矿工纷纷离奇死亡，很快就成为空城，具有贵族身分的加默拥有当地的采矿权，雇用了外籍佣兵凯利来和这群怪物打交道，以免断了自己的财路，不过在镇上肆虐 的并非人类，加默和镇上幸存的镇民必须全副武装，以和这些巨型怪物開始了正面对决...
本片根据社会活动家约翰·戴维森的人生经历改编。他年少时被诊断出患有妥瑞氏综合征，会不受控制地抽动身体或口吐恶言。妥瑞氏综合征迫使约翰与同龄人疏远，而他则不懈与这种鲜为人知的症状作斗争，积极为妥瑞氏人群发声。
In the medieval world of Veroka, monsters and demons alike roam and terrorize humankind. The Bone Devil has plagued the Kingdom of Remény for years. After a group of trackers fails to kill the creature, King Samuel decides to bring in an elite group of monster hunters. These hunters must use every skill they have obtained from around the globe to destroy this ancient evil. Will they be enough, or will the Bone Devil continue its reign of terror?
The circumstances behind a missing teenage girl spirals out of control after her traumatized father and a determined detective search for answers.
