In a ruined world where clean water is more valuable than gold and survival is measured one day at a time, a colossal tower rises above the wasteland. Rumored to contain salvation on its hundredth floor, the structure has become the destination of every desperate survivor willing to risk everything.
Tristan Cooper enters the tower with only a small supply of food, a nearly empty canteen, and a relentless determination to climb. But each floor is its own deadly world—a brutal test of endurance, intelligence, and survival. Scorching deserts, frozen industrial wastelands, endless darkness, and ruthless competitors stand between him and the promise waiting at the summit.
As the number of climbers dwindles and the dangers grow more lethal, Tristan must decide how much of his humanity he is willing to sacrifice to keep ascending.
Because in the tower, reaching the next floor is survival.
Reaching the hundredth may change the fate of humanity itself.