She was born in blood. Forged in vengeance. And now, the Devil is hunting.

At fourteen, Lilith Devereaux committed her first murder—killing the man who stole her childhood. The world called her a victim. But she knew the truth: she had become something else. Something dark.

Years later, the whispers of an assassin who moves like a shadow and kills without mercy spread across the underworld. They call her The Devil—and Detective Julian Cross has spent years chasing her ghost. Haunted by the murder of his pregnant wife, Julian has dedicated his life to bringing down the woman whose crimes defy logic. Every body left in her wake is marked with a symbol, every victim carefully chosen. But when their paths finally collide, Julian sees something he never expected in her ruthless eyes. A flicker of humanity. A past drenched in pain. A woman who should be beyond redemption—but might still have something left to lose.

When Lilith's only tether to humanity is brutally taken from her, she unleashes a firestorm of vengeance, setting her sights on the men who made her a monster. The cult that raised her. The criminals who fear her. And the detective who refuses to let her go.

As the walls close in, Julian and Lilith are forced to confront the truth—some devils are made, not born. But once you've walked through fire, can you ever be saved?

Perfect for fans of gritty crime thrillers, dark antiheroes, and pulse-pounding suspense, When the Devil Walked Alone is a high-stakes game of cat and mouse where obsession blurs the line between justice and vengeance.

Perfect for fans of Gillian Flynn, Stieg Larsson, and Taylor Adams.