It pains me to say this, because I loved the Travelling Pants series, but Brashares really forked the duck on this one. It started off good, but right around the time the main characters realize they have 3 days to save the world, it falls apart when they spend those 3 days playing cards and trying not to have sex. The time traveling time lines are all messed up, and I really don't think Brashares gives young readers enough credit with this one.