At the end of sophomore year, Jill, Hilton, and Lorylyn made a pact to live their lives to the fullest over the summer, and they set out to do exactly that. As Brady and Brooke take a whirlwind tour through Spain and Portugal, the girls, now honed and accomplished liars, spend more and more drunken nights at Landon's and feel less and less guilty about deceiving their parents. Hilton's relationship with Landon takes on a new intensity. Jill, devastated by the gap between herself and Todd that's been created by his relationship with Melanie, gets caught up in a fast and reckless summer fling with a flirtatious, charming boy. Lorylyn struggles with her still very-present feelings for Brady, and Hillary appears suddenly and inexplicably bored with Dirk, although she claims it's really no big deal.
While everyone outwardly parties the summer away and puts on the pretense of being happy, tumultuous forces with the power to change everything are stirring and building behind the scenes...Brady's constant thoughts of Lorylyn, Kara and Andy's budding relationship, Melanie's growing jealousy of Jill, and destructive, devastating secrets kept by one person and by groups of people — secrets no one else could even begin to imagine.