What happens in Cancún, stays in Cancún. That's how it was supposed to go. Reagan Walter was never supposed to see Lucas Friedman, her one-time-hookup again, and she sure as hell never expected to see him on her first day of senior year. *** Reagan Walter has lived her whole life on the sidelines. While her friends spend their weekends getting blasted at parties, they can always count on her to be their sober cab home. But when their junior spring break rolls around, Reagan decides that this time will be different. This time, there will be no holding back.