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YA Novels
Enchantress from the Stars
Age 11 & older
Paperback, pdf, audio


The Far Side of Evil
Age 14 & older
Kindle, epub, pdf, OP paperback


Journey Between Worlds
Age 12 & older
Kindle, epub, pdf, OP paperback


This Star Shall Abide
aka Heritage of the Star
Age 12 & older
Paperback, Kindle, epub, pdf, audio


Beyond the Tomorrow Mountains
High school & adults
Kindle, epub, pdf


The Doors of the Universe
High school & adults
Kindle, epub, pdf


Sylvia Engdahl's Books

Click on Covers for Detailed Information and Purchase Links


Six YA science fiction novels, all republished in both hardcover and paperback in the 21st century

Four adult science fiction novels, independently published in 2007, 2009, 2013 and 2014

A nonfiction book updated and republished in 2012


From the Reviews of My YA Novels

On Enchantress from the Stars: "Not just a novel for young adults but also one of the finest sf novels ever written--a classic of the genre. The only possible complaint one can make is that, after finishing it, you will likely find yourself disinclined for a while to pick up anything else in the genre for fear it will, as it were, taste of ashes. In sum, it is almost impossible to convey how good this book is. Please just read it." --John Grant, Infinityplus

On The Far Side of Evil: "Fiction doesn't have to be profound, just entertaining. But every once in a long while, a novel comes along that is both... [It] speak[s] to the very place of humanity in the universe, and what we need to do to attain and claim it. In an age in which terrorism has threatened our ways of life in unexpected ways, Engdahl's probing story, and the recommendation it contains, are especially relevant." --Paul Levinson, author of Unburning Alexandria

On Journey Between Worlds: "A beautifully-written, heartwarming, and scientifically plausible novel. What's more, it's quite a lot of fun... The sort of thing that's easy to devour in one sitting, and though short, it will leave you satiated afterward. On the other hand, now that I'm done with it, I want more." --John Joseph Adams, Orson Scott Card's Intergalactic Medicine Show,

On Children of the Star: "Once again, Engdahl creates a believable and thought-provoking piece of sf/fantasy that doesn't fall to the usual ray-guns-or-dragons cliches. The questions raised about freedom in this book kept making me pause in the middle of a page, thinking deeply about what was being shown in the story... For fans of originality/ intelligence: there's plenty." --E. A. Solinas, Amazon.com


From the Reviews of My Adult Novels

On Stewards of the Flame: "A thought provoking novel that may make you question the authority and direction of modern Western medical practices. I recommend it to anyone who enjoys reading genre fiction with some substance to it." --Anna Creech, Blogcritics

On Promise of the Flame: "It is not necessary to read the first [book] in order to be enthralled by the second... Engdahl's gift is to make her characters seem comfortable and familiar to the reader, even though their circumstances are not. Although clearly a work of science fiction, the ideas and futuristic possibilities are disturbingly real and will remain with the reader long after they've finished the book." --Peggy LaVake, IndieReader Staff Review

On Defender of the Flame: "This book reaches back to the brio and speculation of Engdahl's classic books of the Seventies... The reader will be taken on an exciting and suspenseful ride... With an admirable protagonist and many interesting and well-drawn characters major and minor, Defender is satisfying on multiple levels... I expected to like this book; I was startled that I loved it. A must read!" --Nicholas Birns, author of Understanding Anthony Powell

On Herald of the Flame: "A futuristic ride that has many parallels in today's society. This is a 'thinking man's' science fiction book - the type we need more of today!" --The Feathered Quill

On the Rising Flame duology: "These novels are not so much genre 'Romance' or even just 'Science Fiction' as they are Literature. These are novels about life." --Jacqueline Lichtenberg, Alien Romances: Reviews 14


From the Reviews of The Planet-Girded Suns

"Engdahl has marshalled an impressive and fascinating selection of primary sources... [She] has shown how deep this vein of speculation runs ... and reminded us that our ancestors entertained a view of the universe that was larger and more imaginative than the history books lead us to believe. Challenging and original." --Kirkus Reviews

Adult Novels
Stewards of the Flame
Adults & mature HS
Paperback and Kindle


Promise of the Flame
Adults & mature HS
Paperback and Kindle


Defender of the Flame
Adults & mature HS
Paperback and Kindle


Herald of the Flame
Adults & mature HS
Paperback and Kindle



The Hidden Flame
Adults & mature high school
Omnibus, Paperback & Kindle


The Rising Flame
Adults & mature high school
Omnibus, Paperback & Kindle


Children of the Star
Omnibus
Adults & high school
Paperback, Kindle, epub, pdf



Originally YA
Omnibus and updated editions
issued as adult

The Planet-Girded Suns
Nonfiction
Adults & high school
Paperback, Kindle, epub, pdf




Also available:
Anthology for teens edited by me
(including all my short fiction)


Anywhere, Anywhen expanded edition
Age 12 & older
Kindle, epub, pdf
What is Ad Stellae Books?

All traditionally-published editions of my books except Enchantress from the Stars are out of print. The current paperback and ebook editions of the others, and of my adult novels, were published by me under the imprint Ad Stellae Books. This is my personal imprint, not a publishing company.

I have also published ebook editions of my mother's YA books under this imprint. Both current and former ebook covers of my books and hers are shown on its page.