Vanish by Camille Peters

A disappearing curse is slowly consuming the Kingdom of Brimoire, causing everything that falls into its path to vanish…including Princess Lisette while en route to wed her fiancé, Crown Prince Lucien, heir to the doomed throne.

But although Lisette has been tainted by the curse, she hasn’t fully succumbed…though an unfortunate side effect is that she’s now been rendered entirely invisible. With her shy nature and painful background, her fate initially seems fortuitous, especially as it’s helped her escape a life of unwanted responsibilities and a union with an indifferent husband…though even an arranged marriage is preferable to disappearing.
While her invisibility allows Lisette to uncover some of Brimoire’s darkest secrets, it does make it rather difficult to fall in love—although joining forces with the deceitful prince may be the last hope for the kingdom on the brink of extinction. On her quest Lisette will not only learn more about herself, her husband-to-be, and what it means to be truly seen…but she’ll discover that the true love she once thought elusive might have been in front of her the entire time.