Cain kills Abel in Chapter Four of the Bible. It is the world's most famous murder. But the Bible is silent about one key detail: the weapon Cain used to kill his brother. That weapon is still lost to history. In 1932, Mitchell Siegel was killed by three gunshots to his chest. While mourning, his son dreamed of a bulletproof man and created the world's greatest hero: Superman. And like Cain's murder weapon, the gun used in this unsolved murder has never been found. Until now.
Today in Fort Lauderdale, Florida, Cal Harper comes face-to-face with his family's greatest secret: his long-lost father, who's been shot with a gun that traces back to Michell Siegel's 1932 murder. But before Cal can ask a single question, he and his father are attacked by a ruthless killer tattooed with the ancient markings of Cain. And so begins the chase for the world's first murder weapon.
Today in Fort Lauderdale, Florida, Cal Harper comes face-to-face with his family's greatest secret: his long-lost father, who's been shot with a gun that traces back to Michell Siegel's 1932 murder. But before Cal can ask a single question, he and his father are attacked by a ruthless killer tattooed with the ancient markings of Cain. And so begins the chase for the world's first murder weapon.
聖經第四章記載，該隱殺了弟弟亞伯，這是舉世著名的謀殺案。但聖經並未清楚交代，該隱是用什麼殺死弟弟，至今凶器依然埋沒在歷史的洪流中。1932 年，米歇爾．席格胸口中了三槍不治。服喪期間，席格的兒子夢到一位刀槍不入的男子，創造出超人。但就像該隱使用的兇器一樣，席格懸案中的那把槍，至今還是下落不明。
時光拉到今日位於佛羅里達的羅德岱堡，凱爾．哈伯面對家族最大的秘密：多年無消無息的父親遭到槍擊，那把手槍可以追溯到 1932 年的米歇爾．席格懸案。但在卡爾未能夠來得及提出疑問前，他和父親便遭到一名身上刺有古老該隱記號的冷血兇手攻擊。於是，世上首起謀殺案的兇器追尋戰，就此展開。