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 editorship. 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 the Gazette’s lead photographer and Meg’s best friend Stephen thinks the fall was innocuous – until Meg shows him a photo of Margaret’s horse sporting a cut saddle after Margaret’s fall. Clearly the “accident” was sabotage. Meg’s prime suspect: Margaret’s teammate and Meg’s arch-nemesis Kitty Cooper. Kitty’s the only member of the team who was MIA after the fall and she’s acting way too shifty for Meg’s taste. Against Margaret’s wishes to let broken girls lie, Meg launches an investigation into the girls’ private lives convinced her amateur sleuthing will uncover the evidence needed to take down Kitty once and for all. As regionals approaches and the investigation veers off in unexpected directions, 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.