"What if all our legends are true? A rousing, fast-paced novel of time travel unlike any other, from acclaimed author Wil McCarthy. What if our legends are older than we think? All the Stone Age has left behind are rocks and bones; all other materials have rotted away, leaving no trace. But what if "cave men" never existed, and the Stone Age was a time of great sophistication still preserved in our oldest stories? In a brilliant and dangerous brain...