Summer Sisters by Judy Blume: Two women from very different families become inseparable companions during summers on Martha's Vineyard during their coming-of-age years, forging the bonds of a lifelong friendship that weathers growing up, marriage, children, careers, and betrayal.
Something Borrowed by Emily Griffen: Rachel has always been the consummate good girl---until her thirtieth birthday, when, after too many drinks, she ends up in bed with her best friend's fiancé. Although determined to put the one-night fling behind her, Rachel realizes she has genuine feelings for the one guy she should run from. As the wedding nears, Rachel knows she has to make a choice. In doing so, she discovers that the lines between right and wrong can be blurry, endings aren't always neat, and sometimes you have to risk all to win true happiness.
Ruby by Anne Hood: Following the tragic death of her husband, Olivia, a grieving New York City milliner, desperately struggles to rebuild her life, until she meets Ruby, a young, pregnant delinquent abandoned by her family, who takes up residence in Olivia's Rhode Island beach house. An unlikely friendship is forged as Olivia nurtures Ruby and her unborn child and experiences the daily challenges presented by a wayward teen, who may or may not teach Olivia how to live again.