On the mountainous border of China and Tibet in 1708, a detective must learn what a killer already knows: that empires' rise and fall on the strength of the stories they tell. Li Du was an imperial librarian. Now, he is an exile. Arriving in Dayan, the last Chinese town before the Tibetan border, he is surprised to find it teeming with travelers, soldiers, and merchants. All have come for a spectacle unprecedented in this remote province: an eclipse...