One day, her fiancé, the Dauphin Georges, makes her an outrageous proposal. She decides to break off the engagement and chooses to leave Georges once and for all. Henrietta thinks she can finally settle down... but then she receives a letter of command from her grandmother, a former princess. She is told to visit the Duke Richard, the brother of the current king, and seduce him. Richard is famous for his love of the arts, his dislike of noise and bustle, his seclusion on his estate in all seasons and his infrequent social appearances. However, when his pushy grandmother sends him on his way, what awaits him is a handsome duke who is not as good-looking as he is rumoured to be...!
「アンリエッタ、ものは相談だが、どうだろう。正妃ではなくて、僕の愛妾にならないか？」。
婚約者である王太子からとんでもない提案をされたアンリエッタは、婚約破棄を決意。
そんなアンリエッタのもとに、元王女である祖母からの命令が。
なんでも、現王の弟である公爵・リシャールを訪ねて、彼を口説き落としてこいとのこと。
リシャールといえば、芸術をこよなく愛し喧噪を嫌い、季節を問わず領地に引きこもり、滅多に社交界に姿を現さないことで有名なお方。
しかし、向かった先で待っていたのは、噂と違うイケメン公爵様で…！？