What Happened to Lani Garver — Carol Plum-Ucci

The close-knit residents of Hackett Island have never seen anyone quite like Lani Garver. Everything about this new kid is a mystery: Where does Lani come from? How old is Lani? And most disturbing of all, is Lani a boy or a girl?
Popular Claire McKenzie isn't up to tormenting Lani with the rest of the high school elite. Instead, she decides to befriend the intriguing outcast. But within days of Lani's arrival, tragedy strikes, and Claire is left questioning herself, her friendships, and, most interesting of all, the possibility that angels may exist on earth.