Series · post-apocalyptic science fiction

Silo

by Hugh Howey

The Silo series by Hugh Howey has 3 books and is best read in publication order, starting with Wool (2011).

Books: 3 books
First published: 2011
Status: ongoing
Last checked: 17 August 2026

Start here: Wool (2011) — then read straight through in publication order.

Book one

Wool (2011)

Reading order

The order the books were released — the default way to read the series.

Book 1:
Wool
Novel2011
Alternative text for cover: Cover of Wool
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Book 2:
Shift
Novel2013
Alternative text for cover: Cover of Shift
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Book 3:
Dust
Novel2013
Alternative text for cover: Cover of Dust
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About the Silo series

Thousands of people live in a massive underground silo, generations removed from whatever destroyed the world above. The air outside is toxic, everyone knows it, and the one rule no one breaks is that you never ask to go outside — because the silo always grants that wish, and no one who leaves the airlock ever comes back. When the sheriff himself asks to go out, his death sets off a chain of events that pulls a reluctant new sheriff, an engineer, and a shadow government of silo administrators into a fight over who really controls the truth about the world above and the world below.

Hugh Howey originally self-published Wool as a single novella in 2011, expecting nothing; reader demand turned it into a five-part story, then a worldwide bestselling trilogy, and eventually the Apple TV+ series Silo (2023-). Shift rewinds the clock to explain how and why the silos were built in the first place, and Dust brings both timelines together for the trilogy's ending. It's claustrophobic, tightly plotted science fiction about surveillance, inherited lies, and what people will do to protect a story they've built a civilization on — good for readers who want post-apocalyptic SF with a mystery-thriller engine.

How to read this series

Read the trilogy in publication order: Wool, then Shift, then Dust. Wool tells the present-day story inside Silo 18; Shift is a prequel explaining how the silos came to exist, centuries earlier; Dust returns to the Wool timeline and resolves both storylines together, so the prequel needs to come before the finale even though it's set earliest in-world.

Each of the first two books was originally serialized in parts before being sold as a single omnibus edition — Wool as five novellas, Shift as three — but nearly every edition in print today is the complete, combined novel, which is what's listed here. A handful of short standalone stories set in the same world ("In the Air," "In the Mountains," "In the Woods") exist but aren't required reading. Hugh Howey has said he's working on a further trilogy following Silo 40, spanning from before Wool to after Dust, but no title or release date has been confirmed yet.

Frequently asked questions

How many books are in the Silo series?

Three: Wool (2011), Shift (2013) and Dust (2013). Each was originally released in serialized parts before being sold as a single combined novel, which is the standard edition today.

What order should I read the Silo books in?

Publication order: Wool, then Shift, then Dust. Shift is a prequel set generations before Wool, but it's meant to be read second, since Dust brings both timelines together and works best once you know both stories.

Is the Silo series finished?

The original trilogy is complete, but Hugh Howey has said he's working on a further trilogy centered on Silo 40 that would span from before Wool to after Dust. No title or release date had been confirmed as of mid-2026.

Is the Silo TV show based on the books?

Yes. Apple TV+'s Silo (2023-) adapts Wool for its first season and has continued into the Shift storyline in later seasons, with some structural changes from the books.

Do I need to read Wool as five separate parts?

No. Wool was originally released as five short serialized parts (Holston, Proper Gauge, Casting Off, The Unraveling, The Stranded) but virtually every edition sold today is the complete omnibus novel combining all five, which is what most readers should buy.