My Best Friend's Girl by Dorothy Koomson
Kamryn Matika doesn't need anyone. She's always done a good job distancing herself from other, but after she found out that her best friend slept with her fiance, Kamryn made the wall around her heart impenetrable. A card from her estranged best friend, however, turns her life upside down. Adele is dying and needs Kamryn to take custody of 4-year-old Tegan, the result of the infamous one night stand.
I'm not sure what I was expecting -- maybe something more chick-lity -- but I found the novel both substantive and charming. It deals with issues like friendship, death, betrayal, and forgiveness, while simultaneously warmhearted and realistic.
The only thing I wasn't crazy about was the focus on Nate (the former fiance) in the middle and end of the novel (and Kamryn being so conflicted). But, I can't really complain about that, as I think that Koomson was trying to be true to her protagonist.