One lovely summer night, fifteen-year-old Melanie stepped into the garden in her nightdress and, climbing a tree, watched the ball her aristocratic neighbor was hosting. Falling from the tree, she ended up in the hands of a handsome man. Melanie didn’t just twist her ankle: seeing the delicate moustache and the mocking gaze of the enchanting Marquis de Varennes, she lost her heart. But love is cruel… and Melanie still has no idea what dangers lie in store for her in the near future. It all begins on a compartment train of the Mediterranean Express, where the romantic story she expects unexpectedly turns into a thrilling detective tale, with reliable partners—Antoine Laurent, a spy-artist, and Pierre Beau, the train conductor. Meanwhile, her triumph in a Lanvin dress at the opera box—and the interest shown in her beauty by the king…