Through Ashes and Betrayal. Through Fire Series, #1

Cameron Trenton has been hunted for six months, by Vigil, by the Bureau, and by the ghosts of Dock 14. Branded a traitor and forced into the shadows, he's survived on grit, instinct, and the single burning truth no one believed: his sister Maggie is still alive, and Vigil will kill her unless he plays their game. Elena Cruz has spent her life chasing justice. When Vigil murdered her father, she vowed to expose the network poisoning Michigan from the inside.
But she never expected her investigation to lead her straight to Cameron-the man the world calls a monster, and the only one who can help her burn Vigil to the ground. When a kill team descends on Cameron's cabin, Elena becomes the next target. Forced into a fragile alliance, they run through storms, gunfire, and the ruins of everything Vigil destroyed. But the deeper they dig, the clearer it becomes: Cameron wasn't Vigil's weapon.
He was their warning. As enemies close in and Maggie's clock runs out, Cameron and Elena must decide what they're willing to sacrifice-and who they're willing to become, to end Vigil once and for all. Because some wars aren't fought for justice, some are fought for redemption. And some are fought for the one person you can't afford to lose.