Some great books have already been mentioned, including:

The Other Bolyne Girl is good. My sister who has never read a book in her life couldn't put it down.

The Kite Runner & A Thousand Splendid Suns by Khaled Husseini are also very good
She's Come Undone by Wally Lamb

White Oleander by Janet Fitch
In addition to those:

******* out of Carolina- Dorothy Allison
I Know This Much is True - another Wally Lamb
Rebecca - Daphne du Marier
Fall on Your Knees - Ann Marie MacDonald
The Pilot's Wife - Anita Shreve