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This Fortress World

by James E. Gunn

Cover artist: Ed Emshwiller

Publisher: Ace

Pub year: 1957

Cover price: 35¢


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Book detail for This Fortress World

Cover tagline

To keep his secret was deadly — to divulge it catastrophic!

Back cover text

Part of Ace Double: The 13th Immortal

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Interior text

He brought the very sky down upon him!

The galaxy itself had suddenly become too small to hide William Dane. For he had stumbled on the secret that every power-mad faction of every planet would kill and torture to obtain. So he learned the ways of the hunted — how to melt into shadow, how to don other men's identities like masquerade costumes.

And then one day Dane could run no more. He had to face his final pursuers — and possibly death itself. But then he knew that if somehow he could learn in time how to use his secret he could save himself ... and with him all mankind ... from annihilation.