Former OSS spy, Sarah Kraft, thought she'd left her dangerous past behind in 1950s New York City. But when her former boss tracks her down and convinces her to accept a new mission-steal the ancient Byzantine Cross from inside the Kremlin for the CIA-she's dragged back into the world of espionage. Once in Moscow, she's promised the aid of a Russian double agent, Nicolai Rodzyanko, but things aren't as they seem. Someone hired a hitman to eliminate Sarah, and she and Nicolai realize they're not the only ones after the mysterious cross. As the two dig deeper into the history behind the oldest known biblical relic, they discover it's far more than a simple artifact. Sarah starts questioning the motives of her former boss and the agency she once trusted, and when supernatural forces come into play, she must make a decision that could change the course of history.