Young Sharur is the scion of a merchant family in the city of Gibil, loyal - he thinks - to his city's god, Engibil, and to that god's human deputies. But like his fellows in Gibil, Sharur is less interested in gods than in progress in invention and trade. Then, on a routine trading expedition, he learns that the gods of the other cities, resentful of Engibil's relaxed attitude toward his people, are uniting to punish Gibil and squelch the growing power of human creativity, epitomized by the city-state's easygoing ways. Now only Sharur's wits can save the city from the aroused divinities...and he's going to need all the inventiveness he can muster.

In a parallel-world 21st-century San Francisco where the Kaiser's Germany won World War One and went on to dominate the world, Paul Gomes and his father Lawrence are secret agents for our timeline, posing as traders from a foreign land. They run a storefront shop called Curious Notions, selling what is in our world routine consumer technology-record players, radios, cassette decks--all of which is better than anything in this world, but only by a bit. Their real job is to obtain raw materials for our timeline. Just as importantly, they must guard the secret of Crosstime Traffic--for of the millions of parallel timelines, this is one of the few advanced enough to use that secret against us. Now, however, the German occupation police are harrassing them. They want to know where they're getting their mysterious goods. Under pressure, Paul and Lawrence hint that their supplies comes from San Francisco's Chinese...setting in motion a chain of intrigues that will put the entire enterprise of Crosstime Traffic at deadly risk.