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 longtime friendship with Darcy and the prospect of losing the love of her life.