Summary: At Long Islands’s private Bennington School, the Diamonds rule supreme. They’re the girls all the boys want to date and all the girls want to be. And fortunately for Marni, she’s right in the middle of them. But then Marni gets a little too close to Clarissa’s ex-boyfriend, Anderson. Wrong move. The Diamonds don’t touch each other’s exes. And just like that, Marni is jettisoned from Diamond to lower than Cubic Zirconia. But Marni isn’t about to take her ouster lying down. She has dirt on the Diamonds, and she’s not about to go down without a fight.