Alison DiLaurentis, manipulative and vindictive "Queen Bee" of Rosewood Day, rules her clique with an iron fist: Spencer Hastings, a perfectionist always trying to outdo her over-achiever sister and the only girl in the group to ever stand up to Alison; Hanna Marin, fat and so desperate to be popular that she willingly bends to Alison's will; Aria Montgomery, a former outsider; and Emily Fields, a competitive swimmer from an ultra-conservative family who is most protective of Alison. But before the start of the 7th grade, Ali disappears after a sleepover with the other girls, and the group falls apart. Three years later, Aria reluctantly returns to town to find Mona Vanderwaal and a thin Hanna to be the new social leaders of Rosewood Day. Soon Aria begins an affair with her English teacher, Spencer falls for her sister's boyfriend, Hanna shoplifts, and purges to stay thin, and Emily is in love with the new girl at school, Maya. Suddenly a mysterious person calling themselves "A" threatens to reveal their secrets from past and present, including ones they thought only Alison knew. Ultimately, Alison's body is found cemented in her former back yard, and the identity of "A" remains unknown.
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