Twenty-four-year-old Elizabeth Wilson learned all too early that money can't buy salvation. The daughter of a millionaire respected in public but monstrous in private, she grew up amidst beatings, broken silences, and a terrified mother. Her father not only destroyed his family but also handed his son over to a clandestine institution dedicated to training professional assassins.

When her mother is brutally murdered in front of her younger brother, Elizabeth flees at just fifteen, burdened by the guilt of leaving him behind. In the shadows, she adopts the name "Nyx" and joins a clandestine group where violence is the law and survival is an art. She remains there until she's nineteen, when she decides to disappear and bury the woman she once was forever.

For years, she manages to live in anonymity… until Ezra Stewart, known in the criminal underworld as "Il Re Nero," bursts into her apartment with an offer she can't refuse: a job that will force them to confront the past that binds them… and the man who shaped their destinies.

There was always tension, passion, and an unspoken truth between them. They love each other, they hurt each other, and they need each other. This time, the target is clear: her father. The price, perhaps, is the last vestige of humanity they have left.