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The much anticipated prequel to bestseller Wool that takes us back to the beginnings of the silo.

In a future less than fifty years away, the world is still as we know it. Time continues to tick by. The truth is that it is ticking away.

A powerful few know what lies ahead. They are preparing for it. They are trying to protect us.

They are setting us on a path from which we can never return.

A path that will lead to destruction; a path that will take us below ground.

The history of the silo is about to be written.

Our future is about to begin.

'We have been mesmerised with Hugh Howey's silo stories since we first laid eyes on book one in the trilogy...' Grazia Daily

'An epic feat of imagination. You will live in this world.' Justin Cronin