In 1939, on the eve of World War II, the World's Fair begins at Flushing Meadows, near New York City. Blathers and Duff, descendants of private investigators, are running the security for the Fair. When they investigate a murder on the Fair's premises, they get tangled up with the Nazi Bund as it works to advance the policies of Hitler in the US, and with a group of out-of-work Jewish actors running various confidence games to raise funds to help Jews escape Europe. Meanwhile, two FBI agents suspect Blathers of a murder elsewhere and also want to find the con artists regardless of motives. As the Fair's second season begins, in the spring of 1940, Blathers and Duff are risking their lives to help the actors. Will their schemes succeed against the killer who stalks them?