Marielle: The French Maiden Series - Book One (The French Maidens #1)
Sylvia Halliday

Armed with only a disguise and her wavering courage, Marielle Saint-Juste goes on a perilous mission to free her brother from unjust captivity. But when she enters the prison of Louis XIII, it isn’t her wounded brother she finds, but a mysterious stranger—and her destiny.
In this French dungeon, a love illuminates the darkest shadows in two hearts. Marielle will not only face her deepest fears, but change her life forever.