A fun read, but one that frustrated me too! Oona time travels throughout her own life every year on her birthday, jumping forward and backward to new years at random. Little details and missing links bugged me as I read it (how did she always have a letter waiting for herself when she leaped if she never knew where she was leaping to?!??) but it was a fun concept and had a plot twist toward the end I did NOT see coming that made it better!