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Sifr is an elite assassin trained by a secret program known as The Hollow, an organization that erased children's identities and turned them into perfect operatives. During what should have been a routine assassination, she recognizes her target from a life she cannot remember. Instead of taking the shot, she makes the first mistake of her career. The decision places her at the center of a conspiracy connected to the Hollow and the people responsible for her past. At the same time, a professional contractor known only as The Gray Man receives an assignment to locate and eliminate her. As both operatives uncover hidden connections, they begin to realize that someone is manipulating events from the shadows. Neither knows who can be trusted. Neither knows the full truth.