Something Borrowed (Giffin)

Something Borrowed 
Emily Giffin, 2004
St. Martin's Press
352 pp.
ISBN-13: 9780312321192


Summary
Rachel has always been a good girl—until her thirtieth birthday, when her best friend Darcy throws her a party.

That night, after too many drinks, Rachel ends up in bed with Darcy's fiancé Dex. Rachel is horrified to discover that she has genuine feelings for Dex.

She prays for fate to intervene, but when she makes a choice she discovers that the lines between right and wrong are blurry, endings aren't always neat, and you have to risk all to win true happiness. (From the publisher.)