Interpol agent Dominique Saint-Sebastian did not imagine that Natalie Clarke, a modest assistant whom he met at Aunt Charlotte's house, would turn out to be such an unpredictable person. This gray mouse in shapeless clothes and glasses with thick lenses not only unearthed the truth about his right to the title of Grand Duke of Karlenberg, but also managed to turn the head of the temperamental agent. Escaping increased media attention, the newly-minted Duke goes to his native Budapest. It is here, in the most romantic city in Europe, that Dominic will have to find out what secrets the mysterious Miss Clark is hiding.