Meg Little desperately wants to be editor in chief of the Haverton Gazette after the former editor resigns to complete a stint in rehab for a raging Adderall addiction. When Margaret Bean, Haverton Prep's star equestrian, is bucked from her horse two weeks before regionals, Meg believes she may have found the story that will win her the coveted position. Margaret's a gold medal-winning rider-she doesn't make mistakes. But the rest of the school buys her fall as an accident. Even Meg's best friend thinks the fall was innocuous-until Meg shows him a photo of Margaret's horse sporting a cut saddle after the event. Clearly, the "accident" was sabotage. Against Margaret's wishes to let broken girls lie, Meg launches an investigation into the equestrian team. As regionals approaches, Meg learns the students of Haverton are far more dangerous than their plaid skirts and blazers suggest-and all the little liars on Margaret's team have something to hide.