Seventeen-year-old Ryven Ashcroft knows how to keep things running. As Ridgehaven's best mask repair tech, he patches cracked seals, replaces clogged filters, and makes sure his neighbors survive the Murk — the toxic yellow fog of chemical warfare that mysteriously returns. He lost his mother to it, his father to grief, and his faith somewhere in between. What he has left is a repair shop, a soldering iron, and the stubborn conviction that broken things can be fixed.

Then the masks start failing. Not from wear and tear, but from something worse. And Ryven is blamed. When he starts pulling threads, he finds a conspiracy that reaches further than Ridgehaven's walls — and a danger that no filter can block.

In a broken world held together with determination and duct tape, Ryven is about to discover that some things can't be fixed alone — and that the faith he walked away from might be the only thing strong enough to carry him through.