Jared Stone is an 1880's federal marshal with old-style crime-solving techniques. The marshal is constantly challenged as he brings together a team consisting of an abrasive yet gifted scientist and a strong-minded young medical student to help bring Silver City into the new age of criminal forensics.

精英狙击手布兰登·贝克特与他的小队在哥斯达黎加执行一项秘密任务时，遭遇阴谋陷害，任务失败演变为国际丑闻。为了掩盖真相，美国政府直接撇清关系，将这群最锋利的战士定性为“恐怖分子”。前一秒还为国效力的英雄，后一秒就成了被自己国家通缉的逃兵。没有合法的身份，没有空中支援，甚至没有合法的射击通道，布兰登陷入了前所未有的孤立无援。