Queen Flavia, dutifully but unhappily married to her cousin Rudolf V, writes to her true love Rudolf Rassendyll. The letter is carried by von Tarlenheim and his servant Bauer to be delivered by hand, but Fritz is betrayed by Bauer and it is stolen by the exiled Rupert of Hentzau and his loyal cousin the Count of Luzau-Rischenheim. Hentzau sees in it a chance to return to favor by informing the pathologically jealous and paranoid King.