Locked up by The Second Prince

Jeanne is a hardworking law student struggling to balance classes, a part-time job, and family responsibilities. Her only escape is fantasy novels.
One day, while browsing a small bookstore, she discovers a strange novel called The War of the Two Princes. The book has no author, no publisher, and no explanation for where it came from.
Curious, Jeanne begins reading.
Drawn into the story of Crown Prince Cedric, his future bride Princess Louise, and the infamous Second Prince Lucien, she quickly becomes obsessed with the kingdom of Kazhar.
Until she wakes up inside the novel.
Captured by royal soldiers and mistaken for a palace concubine, Jeanne suddenly finds herself trapped in the very story she was reading.
Armed with only half-finished knowledge of the plot, Jeanne is determined to stay out of trouble, find the mysterious book, and return home.
Unfortunately, Prince Lucien seems far more interested in keeping her locked up than letting her leave.