“A Girl Meets a Boy” is a book from a series of ancient myths reimagined by modern writers from different countries, including Antonia Susan Byatt, Margaret Atwood, David Grossman, Su Tun, Olga Tokarczuk, Viktor Pelevin, and others. A clever, dramatic story about the lives of two Scottish sisters intertwines with one of the happiest love stories from Ovid’s “Metamorphoses.” A book about girls and boys, girls and girls, love, transformations, and how to be yourself—even if you have to go against the system.