The rules for swimming are simple: Rule #1: There is no lifeguard on duty. Since her mom died three years ago, nineteen-year-old Zosia Easton's been treading water. Living at home. Community college. Same old Saturday nights. So when her father breaks the news he's taken a job transfer-and by the way, it means renting out the house that's been her refuge-a summer in Tokyo feels like it just might be a chance to start swimming again. Rule #2: Beware...