3.5 stars, rounding up. When a time travel book is well-executed, it is a delight. This one has a bit of a chick lit vibe that keeps it from being great, but the premise is fun and well-executed, even if a bit confusing at times. (There is a desire to go back and read the chapters sequenced chronologically to see if they hold up when Oona is IN order – but the events aren't so compelling that I'd spend time doing that.) Overall, a well-done trollop through time with a good bit of mystery and twists lurking in the pages.