By Russell Knight

She whispers peace. Her words bring death.

When inmate Carmen Soto is found dead in a Barcelona prison cell, veteran forensic psychologist Dr. Mercedes Hurtado is called in to investigate. But this isn't the first death—and they all share one chilling connection: Ainhoa Laredo, an enigmatic inmate known as “the Witch of Unit Three.”

At Wad-Ras Women's Penitentiary in Barcelona, evil doesn't wear a mask—it smiles, listens, and quietly persuades broken souls to surrender. As Mercedes unravels the psychological threads tying Ainhoa to a string of mysterious suicides, she uncovers a horrifying possibility:

What if the weapon is not a hand... but a voice?

Now, Mercedes must confront the darkness inside others—and within herself—as her investigation spirals into a battle of faith, reason, and survival. Because Ainhoa doesn't just manipulate thoughts—she manipulates hope.

And in a city known for its beauty and secrets, Barcelona’s darkest shadows lie inside the mind.

• Christian thrillers with psychological depth

• Strong female leads facing spiritual and ethical challenges

• International suspense with a European setting

• Dark faith-based crime fiction exploring good, evil, and redemption

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• Terri Blackstock

• Charles Martin

• Tosca Lee