No one is sent to the Underground. They're taken. Watched long before they ever realize it, studied in the moments that matter-the second they choose violence over hesitation, survival over mercy. That's when they're marked. That's when the Underground decides they're worth keeping. Buried beneath the surface, it isn't a prison. It's a world. A system built from steel and shadows, where the most dangerous people alive are turned into something even worse-something useful. They don't get second chances, they don't get out, and they don't get to be human anymore.
Nyla Stone was sixteen when they took her, the youngest ever chosen. By then, she was already a weapon, raised in blood and trained to kill before she was old enough to understand what it meant. Cold, precise, and impossible to read, she survived by never needing anyone and never looking back.
Kayden Jones was eighteen when they stopped watching him and brought him in. Anyone who could wipe out an entire bloodline without hesitation wasn't someone the Underground would eliminate-they were someone it would use. Known as Bullet, he's feared for a reason: he doesn't miss, he doesn't hesitate, and he doesn't feel anything he can't control.
In the Underground, loyalty is forced, violence is currency, and power belongs to the ones willing to take it. There's only one rule no one is supposed to break: don't get attached. Nyla has never cared about anyone, and Kayden has never needed anyone. But when they're forced into the same unit, control starts to slip, lines begin to blur, and something far more dangerous than violence takes hold.
Because in a world built on killers, the only thing more lethal than what they've been made into... is what they could become together.
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