The plot's pretty loose - an American journalist is swept away by a prince in a faraway country but something suspicious is afoot. In order to solve the mystery, you have to go to several different sites and find hidden objects. As you find more and more objects, you progress through the various "chapters" of the novel.
The graphics are really pretty and pretty realistic (ha), and it was pretty cute that they chose to build the game around a romance novel. It's free to play for an hour, and you have to buy the game after that. Check it out at Big Fish Games. (Available on both Mac and PC)