by Asghar Ali (Author)

One assassin. One virus. One chance to stop the end of humanity.

Five years ago, Ryō killed his Yakuza partner Niko-after watching him murder the woman he loved.

Now living as Hiroshi Ichihara, a quiet college student, he's buried his past. A second chance. A normal life.

Until a first date shatters everything.

Forced to reveal himself, Ryō discovers the impossible: Niko is alive.

Worse, he's united the Yakuza clans and engineered a CRISPR virus that could destroy the world. Only one person can stop him-the assassin Ryō swore he'd never become again.

But there's a price. Every kill awakens the darkness inside him, the bloodlust that made him Tokyo's most feared killer. The more he fights, the more his humanity slips away.

With Ayako Yanagi-a brilliant doctor caught in the crossfire-as his only ally, Ryō must return to Tokyo's underworld to infiltrate Niko's genetically enhanced army and stop the virus before it's unleashed. But defeating his former brother-in-arms may cost him the one thing he's fought to keep: his soul.

Can he save the world without becoming the monster he fears most?

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