Skip to Main Content (Press Enter)
Before you go...
Check Out
The Bestselling Books of All Time
See the List
Judgment Day by Terry Pratchett, Ian Stewart and Jack Cohen

Look Inside

Judgment Day

Science of Discworld IV: A Novel

Science of Discworld IV: A Novel

Science of Discworld IV: A Novel

By Terry Pratchett, Ian Stewart and Jack Cohen

By Terry Pratchett, Ian Stewart and Jack Cohen

By Terry Pratchett

By Terry Pratchett

By Terry Pratchett, Ian Stewart and Jack Cohen
Read by Michael Fenton Stevens and Stephen Briggs

By Terry Pratchett, Ian Stewart and Jack Cohen
Read by Michael Fenton Stevens and Stephen Briggs

Best Seller

Part of Science of Discworld Series

Part of Science of Discworld Series

Part of Science of Discworld Series

Paperback $15.95

Dec 22, 2015 | ISBN 9780804169004

Ebook $10.99

Jan 26, 2016 | ISBN 9780804172257

Audiobook Download $22.50

Dec 22, 2015 | 738 Minutes

All Formats
+
    Judgment Day by Terry Pratchett, Ian Stewart and Jack Cohen
    Paperback $15.95
    Dec 22, 2015 | ISBN 9780804169004

    Also available from:

    See All Formats (2) +

    Paperback
    –

    • Paperback $15.95

      Dec 22, 2015 | ISBN 9780804169004

      Also available from:

    Ebook
    +

    • Ebook

      Jan 26, 2016 | ISBN 9780804172257

      Available from:

    Audio
    +

    Buy the Audiobook Download:

    About Judgment Day

    The wizards of Unseen University are again called upon to defend their creation, Roundworld, this time in a courtroom—where its very existence hangs in the balance.
     
    The Omnians fervently believe that the world is round, not flat, and view the discovery of Roundworld as a vindication of their faith. To leave this artifact in the hands of the wizards would be unacceptable. Not only do the academics hold that Discworld is flat, but by creating the Roundworld universe, they have elevated themselves to the level of gods. Ankh-Morpork’s venerable tyrant Lord Vetinari agrees to a tribunal, where the wizards Ridcully, Rincewind, and Ponder Stibbons can present their case—with key assistance from a Roundworld librarian named Marjorie Daw.
     
    JUDGMENT DAY weaves together explorations of such Earthly topics as big science, creation, subatomic particles, the existence of dark matter, and the psychology of belief–a treat for Discworld fans and readers of popular science alike.

    About Judgment Day

    The wizards of Unseen University are again called upon to defend their creation, Roundworld, this time in a courtroom—where its very existence hangs in the balance.
     
    The Omnians fervently believe that the world is round, not flat, and view the discovery of Roundworld as a vindication of their faith. To leave this artifact in the hands of the wizards would be unacceptable. Not only do the academics hold that Discworld is flat, but by creating the Roundworld universe, they have elevated themselves to the level of gods. Ankh-Morpork’s venerable tyrant Lord Vetinari agrees to a tribunal, where the wizards Ridcully, Rincewind, and Ponder Stibbons can present their case—with key assistance from a Roundworld librarian named Marjorie Daw.
     
    JUDGMENT DAY weaves together explorations of such Earthly topics as big science, creation, subatomic particles, the existence of dark matter, and the psychology of belief–a treat for Discworld fans and readers of popular science alike.

    About Judgment Day

    The fourth book in the Science of Discworld series, and this time around dealing with THE REALLY BIG QUESTIONS, Terry Pratchett’s brilliant new Discworld story Judgement Day is annotated with very big footnotes (the interleaving chapters) by mathematician Ian Stewart and biologist Jack Cohen, to bring you a mind-mangling combination of fiction, cutting-edge science and philosophy.

    Marjorie Dawe is a librarian, and takes her job — and indeed the truth of words — very seriously. She doesn’t know it, but her world and ours — Roundworld — is in big trouble. On Discworld, a colossal row is brewing. The Wizards of the Unseen University feel responsible for Roundworld (as one would for a pet gerbil). After all, they brought it into existence by bungling an experiment in Quantum ThaumoDynamics. But legal action is being brought against them by Omnians, who say that the Wizards’ god-like actions make a mockery of their noble religion. As the finest legal brains in Discworld (a zombie and a priest) gird their loins to do battle — and when the Great Big Thing in the High Energy Magic Laboratory is switched on — Marjorie Dawe finds herself thrown across the multiverse and right in the middle of the whole explosive affair.

    As God, the Universe and, frankly, Everything Else is investigated by the trio, you can expect world-bearing elephants, quantum gravity in the Escher-verse, evolutionary design, eternal inflation, dark matter, disbelief systems — and an in-depth study of how to invent a better mousetrap.

    Also by Terry Pratchett

    A Blink of the Screen
    The World of Poo
    A Slip of the Keyboard
    Dragons at Crumbling Castle
    The Compleat Ankh-Morpork
    See all books by Terry Pratchett

    Also by Terry Pratchett

    A Blink of the Screen
    The World of Poo
    A Slip of the Keyboard
    Dragons at Crumbling Castle
    The Compleat Ankh-Morpork
    See all books by Terry Pratchett

    Also by Terry Pratchett

    A Blink of the Screen
    The World of Poo
    A Slip of the Keyboard
    Dragons at Crumbling Castle
    The Compleat Ankh-Morpork
    See all books by Terry Pratchett

    About Terry Pratchett

    TERRY PRATCHETT is the acclaimed creator of the globally bestselling Discworld series, the first of which, The Color of Magic, was… More about Terry Pratchett

    About Ian Stewart

    Ian Stewart is Professor of Mathematics at the University of Warwick and won the Royal Society’s 1995 Michael Faraday Medal… More about Ian Stewart

    About Jack Cohen

    Jack Cohen is a biologist and science writer and long-time collaborator of Ian Stewart’s.

    About Terry Pratchett

    TERRY PRATCHETT is the acclaimed creator of the globally bestselling Discworld series, the first of which, The Color of Magic, was published in 1983. In all, he is the author of more than seventy books. His novels have been widely adapted… More about Terry Pratchett

    About Terry Pratchett

    TERRY PRATCHETT is the acclaimed creator of the globally bestselling Discworld series, the first of which, The Color of Magic, was… More about Terry Pratchett

    About Ian Stewart

    Ian Stewart is Professor of Mathematics at the University of Warwick and won the Royal Society’s 1995 Michael Faraday Medal… More about Ian Stewart

    About Jack Cohen

    Jack Cohen is a biologist and science writer and long-time collaborator of Ian Stewart’s.

    Product Details

    Category: Science Fiction & Fantasy

    Paperback | $15.95
    Published by Anchor
    Dec 22, 2015 | 368 Pages | 5-3/16 x 8 | ISBN 9780804169004

    Category: Science Fiction & Fantasy

    Ebook | $10.99
    Published by Anchor
    Jan 26, 2016 | 336 Pages | ISBN 9780804172257

    Category: Science Fiction & Fantasy | Audiobooks

    Audiobook Download | $22.50
    Published by Random House Audio
    Dec 22, 2015 | 738 Minutes | ISBN 9780553397994

    Inspired by Your Browsing History

    Also in

    ‹ ›
    Indiana Jones and the Temple of Doom
    Indiana Jones and the Temple of Doom
    James Kahn
    Black Jack, Volume 14
    Black Jack, Volume 14
    Osamu Tezuka
    Transformers: IDW Collection Phase Two Volume 3
    Transformers: IDW Collection Phase Two Volume 3
    James Roberts, John Barber and Nick Roche
    StarCraft: Soldiers (Starcraft Volume 2)
    StarCraft: Soldiers (Starcraft Volume 2)
    Andrew Robinson and Jody Houser
    Journey to the Center of the Earth
    Journey to the Center of the Earth
    Jules Verne
    Aliens: The Official Movie Novelization
    Aliens: The Official Movie Novelization
    Alan Dean Foster
    Warlord of Mars
    Warlord of Mars
    Edgar Rice Burroughs
    Berserk Volume 1
    Berserk Volume 1
    Kentaro Miura
    Do You Think What You Think You Think?
    Do You Think What You Think You Think?
    Jeremy Stangroom and Julian Baggini
    Helfort's War Book 2: The Battle of the Hammer Worlds
    Helfort’s War Book 2: The Battle of the Hammer Worlds
    Graham Sharp Paul
    The Best of Robert E. Howard Volume 1
    The Best of Robert E. Howard Volume 1
    Robert E. Howard
    The Time Machine and The War of the Worlds
    The Time Machine and The War of the Worlds
    H. G. Wells
    Helfort's War Book 1: The Battle at the Moons of Hell
    Helfort’s War Book 1: The Battle at the Moons of Hell
    Graham Sharp Paul
    American Science Fiction: Five Classic Novels 1956-58 (LOA #228)
    American Science Fiction: Five Classic Novels 1956-58 (LOA #228)
    Various
    xxxHOLiC Omnibus 3
    xxxHOLiC Omnibus 3
    CLAMP
    Tarzan of the Apes
    Tarzan of the Apes
    Edgar Rice Burroughs
    The Michael Moorcock Library - Elric Vol 3: The Dreaming City
    The Michael Moorcock Library – Elric Vol 3: The Dreaming City
    Roy Thomas
    Star Hawks, Vol. 2: 1978-1979
    Star Hawks, Vol. 2: 1978-1979
    Archie Goodwin and Ron Goulart
    Angel Catbird Volume 2: To Castle Catula (Graphic Novel)
    Angel Catbird Volume 2: To Castle Catula (Graphic Novel)
    Margaret Atwood
    Doctor Who: The Thirteenth Doctor Volume 0 - The Many Lives of Doctor Who
    Doctor Who: The Thirteenth Doctor Volume 0 – The Many Lives of Doctor Who
    Richard Dinnick
    Ajin, Volume 9
    Ajin, Volume 9
    Gamon Sakurai
    Short Shorts
    Short Shorts
    Ilana W. Howe and Irving Howe
    Helfort's War Book 3: The Battle of Devastation Reef
    Helfort’s War Book 3: The Battle of Devastation Reef
    Graham Sharp Paul
    Transformers: The Complete All Hail Megatron
    Transformers: The Complete All Hail Megatron
    Shane McCarthy
    Isaac Asimov's I, Robot: To Preserve
    Isaac Asimov’s I, Robot: To Preserve
    Mickey Zucker Reichert
    The Crucible
    The Crucible
    Arthur Miller
    Oh My Goddess! Volume 1
    Oh My Goddess! Volume 1
    Kosuke Fujishima
    Attack on Titan: Colossal Edition 2
    Attack on Titan: Colossal Edition 2
    Hajime Isayama
    Bloody Monday 6
    Bloody Monday 6
    Ryou Ryumon
    Alien: The Official Movie Novelization
    Alien: The Official Movie Novelization
    Alan Dean Foster
    Time Shards
    Time Shards
    Dana Fredsti and David Fitzgerald
    Legends of the Duskwalker (Limited Edition)
    Legends of the Duskwalker (Limited Edition)
    Jay Posey

    Praise

    “Stewart, Cohen and Pratchett set out to puzzle us and make us think differently…. This is exhilarating.” –A. S. Byatt, New Statesman

    “Fascinating and entertaining. . . . It’s baffling why this appealingly distinctive offshoot of the wildly popular Discworld yarns took so long to cross the Atlantic.” —Kirkus Reviews

    Back to Top

    Visit other sites in the Penguin Random House Network

    Raise kids who love to read

    Brightly

    Raise kids who love to read
    An online magazine for today’s home cook

    TASTE

    An online magazine for today’s home cook
    The eBooks you want at the lowest prices

    LitFlash

    The eBooks you want at the lowest prices
    Read it first. Pass it on!

    Read it Forward

    Read it first. Pass it on!