Six months after his first battles as Sentinel, Caleb Vance has never been faster. He saves lives in the blink of an eye, stops disasters before they happen, and finally feels like the hero the city needs him to be. But every victory carries a shadow. Somewhere in the dark, Ironclad is watching, studying his every move, waiting for the moment to strike.Caleb has SJ by his side, the one person who keeps him grounded, the only person who makes him believe he's more than the mask he wears. She is his anchor, his reason to keep running, even as the city grows more dangerous and his enemies more relentless. But when Ironclad begins recruiting others and turning the streets into his own battlefield, Caleb realizes his speed alone may not be enough to stop him.As Sentinel's world begins to fracture, trust is tested, alliances are forged, and the line between friend and enemy blurs. To save the people he loves, Caleb will have to face the one truth he's most afraid of: Ironclad knows him better than anyone, because once, they were brothers.The second chapter in the Velocity Trilogy raises the stakes, deepens the scars, and sets the stage for a reckoning that will change everything.