Disaster has overwhelmed the Tower. War has been declared. Sabotage, corruption, greed and terror sweep the cities. In the thrilling conclusion to the Welltower trilogy, Kaehl and Selda risk their lives one last time to save their society from annihilation as they plunge into the looking-glass world called Welltower.

A young man battles to save his crippled sister in a looking-glass world. Welltower is set in a global inferno of poisonous gasses and mutated beasts. The sanctuary city called Welltower was built to keep them out. Over two miles high, the fortified structure rises over the burning landscape like a colossus: unbreakable, impenetrable, unyielding. But all is not as it seems. After hundreds of years the residents have become beasts themselves, humans in the last stages of social decay. The sanctuary has become a prison. Young Kaehl will travel the heights and depths of this battleground city in order to save his crippled sister. Along the way he will discover his soul as he uncovers the terrible secrets of the looking-glass world called Welltower.

Kaehl and Selda have found healing, happiness, and new friends in the utopian land of Alizon, guardian of Welltower's secrets. They have also found new foundations for their lives and a desire to give back. But all is not as it seems. Alizon has its enemies, too, and once more the brother and sister team must descend into the depths of Welltower to solve its deadly mysteries. Torn apart by their new missions, they quickly find themselves mired in the moral and physical decay of their dying city. Traveling separate paths, they both find new strength and abilities as they battle the Tower's corrupt elite, racing for their lives against disease and unexpected disaster in the looking-glass world called Welltower.