In chapter four of the Bible, Cain kills Abel. 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 two gunshots to the 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. Today in Fort Lauderdale, Florida, Cal Harper comes face-to-face with his own family tragedy: His long-missing father has been shot with a gun that traces back to Mitchell Siegel's 1932 murder. But soon after their surprising reunion, Cal and his father are attacked by a ruthless killer tattooed with the ancient markings of Cain. So begins the chase for the world's first murder weapon...

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