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.

"Mild and sensitive Richard Hieck endured a quietly difficult childhood in Germany. Raised in humble circumstances, Richard was profoundly influenced by his withdrawn mother and by his father, an enigma whose devotion centered not on his five children but on his mysterious career. From his father, Richard inherited an interest in the night sky, learning to love the constellations and to take comfort in the strength of Orion and the warm radiance of Venus. Richard's shadowy, elusive father also influenced him to pursue studies in mathematics, a field offering Richard the discipline he had craved as a child." "Published in 1933, The Unknown Quantity is Hermann Broch's study of the underlying chaos - and, finally, the impossibility - of life within a society whose values are in decay. As Richard seeks to reconcile the conflicting demands of love and science, of passion and reason, societal and family values begin to undermine him and those in orbit around him." --Book Jacket.