She was the quiet one
(Book)

"When twin sisters Rose and Bel Enright enroll in The Odell School, a prestigious New Hampshire boarding school, it seems like the opportunity of a lifetime. But the sisters could not be more different. The school brings out a rivalry between them that few ever knew existed. And the school itself has a dark underbelly: of privileged kids running unchecked and uninhibited; of rituals and traditions that are more sinister than they seem; of wealth and entitlement that can only lead to disaster. For Sarah Donovan, wife of an ambitious teacher who is determined to rise through the ranks, Odell also seems like the best thing that could happen to their small family. But how well does she really know her husband? What lengths will he go to to achieve his goals? And when one dark night ends in murder, who is guilty, who knows the truth, and who has been in on it all along?"--