This story is set in Hugh Howey's world of Wool "We all have a reason for being here, we're just not sure what it is." Time is running out. As the Great Flood threatens to consume the silo, Ace and a team of divers are in a desperate battle to avert disaster. When a terrible accident destroys the person he cares about most, Ace has little left to live for. After nearly succumbing to the silo's flooded depths, he realizes that drastic measures must be taken in order to save their underground home. But those in charge deem his ideas too dangerous, his methods too forbidden, and he is shunned for his sin of toxic words. When an opportunity for redemption presents itself, Ace has only one question: Why should he fight to save these people, if they aren't willing to help themselves?

What would you do if the world you lived in was a lie? Where every birth required a death, and those in charge stopped at nothing to achieve complete control? When Ace's actions send the lives of thousands into turmoil, the people of the silo will have to make some very difficult decisions. To make matters worse, the encroaching flood is causing sensitive electronic equipment to go haywire which has unforeseen consequences for the young women of the silo. Follow the stories of Tommy and Keira as they battle against the flood and the oppression of their world, Tony, an IT tech thrown headfirst into the silo's inner politics and secret knowledge, and Head of IT Charles Beaty as he tries to rein in the problems which are assaulting him from all angles. Welcome to the Silo. This is the follow-up story to The Runner, taking place in Hugh Howey's world of WOOL.

After Ace fails to clean the sensors, he disappears over a hill and out of sight, leaving chaos and confusion in his wake. Nothing could have prepared him for what he found on the other side. The Watcher is a startling account of what happens when boundaries are crossed, when taboos are broken, and when two silos are thrown into the toxic winds of change. Is there truly no hope? Find out in this final volume of the "Silo Submerged" saga, which began with the Wool inspired novella, The Runner.