Ancient Shores

Something very strange has turned up in Tom Lasker's wheat field: a ten-thousand-year-old sailboat made of an unknown substance. And then there's the Roundhouse, apparently a doorway to another world, sitting squarely on Sioux reservation land. How did they get there, and what do they signify for the people embroiled in their discovery? This is sci-fi on a grand scale by the author of The Engines of God.