Twinchantment
(Book)

"Princesses Flissa and Sara are even closer than most twins. In fact, most of the kingdom thinks they're the same person. When magic was outlawed in Kaloon generations ago, twins, black cats, and other potentially-magical beings were outlawed, too. Since they were born, Flissa and Sara have pretended to be one princess, Flissara, trading off royal duties like attending glamorous balls, participating in fencing exhibitions, and making friends with other young nobles, all while hiding in plain sight. But when the first magical attack in years puts their mother's life in danger, the girls must break the rules that have protected them to save her. Enlisting a brave servant boy and his plucky black kitten as their guides, they set off on an epic quest to the Twists--a forbidden place full of dark magic--to find the evil mage who cursed the queen. With a case of mistaken identity, a wickedly powerful exile out for vengeance, and time running out for their mother, the twins might just need to make their own magic to save the day."--Page [2] of cover.