Greatfall: A Silo Novel is a dark new tale set in the world of Wool, Hugh Howey’s beloved post-apocalyptic vision of humanity and its struggle to survive. 

What happens when a silo falls silent? Maya has been sent to Silo 23 to investigate. Unplugged from the grid, the silo appears to be dead, rotted from within. But what Maya finds is a silo that is anything but deceased. Shut off from the outside world and other silos, Silo 23 has evolved into something unexpected, something more horrifying than Maya could have anticipated.