Having escaped the restrictive society of British-ruled Bombay, Anglo-Indian soldier-turned-detective Captain Jim is just settling in to life in Boston when he's called to investigate an underground plot to sabotage the 1893 Chicago World's Fair. His wife, Diana, grows concerned when several weeks pass without communication from him, and she endeavors to track him down, inadvertently ensnaring herself deep within his case. The inquisitive newlyweds must work together to save the event of the century…and their own lives.