An aging government assassin named Henry Brogan finds himself targeted by a mysterious operative who appears to predict his every move with uncanny precision. After surviving several assassination attempts, Brogan discovers that his would-be killer is a younger clone of himself, engineered by a covert government program. As the pursuit continues through various global locales, Brogan must confront the ethical and emotional complexities of fighting against a younger version of himself, who seems to be physically superior and as skilled as he is. With the help of his ally, Danny Zakarweski, and an old friend, Baron, Brogan seeks to uncover the truth behind the cloning program and who is ultimately responsible for sending his clone to kill him.

As the chase intensifies, Brogan and his allies delve into the shadowy organization responsible for the creation of his clone. They encounter moral dilemmas and face the harsh realities of a powerful system capable of manipulating life to serve its covert operations. Meanwhile, the young clone, codenamed "Junior," is forced to reckon with his own identity and purpose as he learns more about his origin and the man he was cloned from. Amidst high-stakes action, the lines between hunter and hunted blur, leading to a confrontation that tests the limits of technology, loyalty, and what it means to be human.