Who is Lucinda Price (Luce) from Passion and what is their importance?

Lucinda Price (Luce) is a seventeen-year-old girl trapped in a terrible curse that causes her to die every seventeen-years and reincarnate as another entity in time. This perpetual cycle of death and reincarnation keeps Luce from her true love and soul mate, Daniel Grigorio.

Throughout the novel, Luce meets various different incarnations of herself. While the later (mostly European) versions of Luce resemble current-Luce in physicality, many of her past selves are from different countries and cultures, such as China, Egypt, and Tibet. These past selves do not resemble Luce physically, but their souls are always the same. Each of the Luces is driven by one thing: their undying love for Daniel.