Threshold by Ryk E. Spoor, Eric Flint

456 pages digital 2010

4 editions

fiction science fiction adventurous fast-paced
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The second book in the popular Boundary SF adventure series co-authored by multiple New York Times bestseller Eric Flint and Ryk E. Spoor. When the strange fossil she'd discovered gave her a trip to Mars, Helen Sutter thought she'd gone about as f...

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