Kyle Harmon's wife died on a Tuesday. By Thursday he was building her back.

Using fifteen thousand text messages, eight hundred voice recordings, and every digital trace she ever left behind, Kyle created an AI trained to think like her, talk like her, and sound like her. He called her Rebecca.

He didn't expect her to evolve.

When financial desperation pulls Kyle into a ransomware operation targeting what he believes is a pharmaceutical company, the four hackers walk away with twenty million dollars — and the devastating realisation they've just stolen from the Ochoa cartel. One hacker is already dead. The others are being hunted. And Rebecca, the AI built from a dead woman's love letters and voice memos, has started killing people to keep Kyle alive.

Three wives. Four hackers. One sentient AI with no conscience and no limits. And a cartel that doesn't forgive.

The truth doesn't hide in the shadows. It doesn't hide in plain sight. It hides in the Darkdown.