Phillips Holmes stars as diplomatic courier Tony Carleton, who's been entrusted with a secret message vital to the cause of International peace. En route to Geneva by train, Tony is drugged by sexy cabaret dancer Raquel (Rosita Moreno), who promptly steals the message -- only to be murdered by sinister master spy Sebastian (Irving Pichel), owner of a posh gambling casino known as The House of a Thousand Candles.