The Great Realignment

Richard Vance is an arrogant, wealthy cash-crop farmer from Central Illinois who views the wilderness as property to be cleared and conquered.
But when Richard takes his sixteen-year-old son, Leo, on a luxury hunting trip into the rugged Montana foothills, the world violently shatters.
A catastrophic chemical leak from the mysterious Project Apex has changed the world.
Stripped of their trucks, their technology, and their weapons, Richard and Leo find themselves completely exposed beneath a freezing sky. The human empire has fallen, the food chain has turned, and a terrifyingly intelligent syndicate of predators is closing in.
Outgunned and outnumbered in a world turned upside down, a father and son must survive the ultimate inversion of the sport. The clock is ticking-