Rachel White is the consummate good girl. A hard-working attorney at a large Manhattan law firm and a diligent maid of honor to her charmed best friend Darcy, Rachel has always played by all the rules. Since grade school, she has watched Darcy shine, quietly accepting the sidekick role in their lopsided friendship. But that suddenly changes the night of her thirtieth birthday when Rachel finally confesses her feelings to Darcy's fiance, and is both horrified and thrilled to discover that he feels the same way. As the wedding date draws near, events spiral out of control, and Rachel knows she must make a choice between her heart and conscience. In so doing, she discovers that the lines between right and wrong can be blurry, endings aren't always neat, and sometimes you have to risk everything to be true to yourself.
Rachel is a generous and loyal pal to her engaged best friend Darcy. But after celebrating her 30th birthday, perpetual good girl Rachel unexpectedly ends up in the arms of Dex, the guy she’s had a crush on since law school…and who happens to be Darcy’s fiancé. In the frantic weeks leading up to Darcy’s wedding, Rachel finds herself caught between her long-time friendship with Darcy and the prospect of losing the love of her life.