I like a good twist on time travel, and this book is definitely that. Oona jumps through the years of her life, and the book never delves too deeply into the questions of how or why it happens. The story raises many questions: can she change her fate, or is any attempt to do so doomed? Are there multiple stories of her life? How did this start - how could there have already been an Oona who lived the previous year when she does her first jump? Is everything predestined? Do we have free will? In the end, it's left to the readers to find our own answers to these questions, and enjoy the story as we go along. Lots of good music gets a nod, too.