Sold into servitude as a young girl, Laveri Attilie was denied an education but blessed with an extraordinary gift for words. To the common people, she was the celebrated "Madame Rosa," a ghostwriter who penned their most passionate love letters.

Her secret life takes a startling turn when a mysterious noble commissions her to write love letters to their own younger brother, Cedric. For Laveri, who dreams of earning enough to buy her freedom from the mansion, the offer is too good to refuse. She launches a campaign of seduction by ink, crafting the most exquisite letters she can imagine. But her plan is thrown into chaos when a response arrives, not for Madame Rosa, but for the one name she thought no one knew, Laveri!