It's 1938, in San Francisco. A world's fair is preparing to open on Treasure Island, a war is brewing overseas, and the city is alive with possibilities. Grace, Helen, and Ruby, three young women from very different backgrounds, meet by chance at the exclusive and glamorous Forbidden City nightclub. The girls become fast friends, relying on one another through unexpected challenges and shifting fortunes. But after the Japanese attack Pearl Harbor, paranoia and suspicion threaten to destroy them.