Raney wants to enjoy being a bridesmaid at her friend's wedding, but the best man, Justin Woodward, keeps putting a damper on her mood. He's brilliant and kind of geeky - not at all the kind of guy she's used to - but she's always been nice to him, so she can't figure out why he acts so cool and obnoxious with her.
It shouldn't matter what he feels about her, but she can't stop thinking about him. So her mission for the weekend is to get Justin to like her. Her attempts don't seem to work at all.
But then everything changes in only one night.