故事讲述玫瑰镇镇中学的社交女王Alison失踪一年后，她的四位好友Spencer、Hanna、Aria和Emily突然收到一条署名为"A"的神秘短信。"A"威胁说要揭发这四位美少女的秘密，包括她们隐藏了很久的、只有Alison才知道的秘密。第五季的故事由此展开……
汉娜被关进了艾莉森所在的监狱，安德鲁继续向艾瑞亚发动爱情攻势。艾莉森的庭审将至，证人的证词将她的谎言逐一撕碎。杰森试图改变供词帮助艾莉森，不料控方律师却无情的揭露他与汉娜母的恋情。与此同时，斯宾塞、艾瑞亚、艾米丽和迦勒试图寻找足够的信息来洗清汉娜的罪名。姐妹们重回梦娜家发现了一些线索，但是她们却无…
丽贝卡劝说艾莉森承认谋杀罪以换取从轻处理，艾莉森开始犹豫不决。科林邀请艾米丽观看话剧，两人共度了愉快的一晚。汉娜的母亲得知汉娜与梦娜的事有所牵连，汉娜无奈之下只好向母亲解释缘由。艾莉森在狱中屡出状况，迫于压力她同意认罪。汉娜得知艾莉森已经认罪十分恐慌，她在迦勒的建议下准备告知坦娜A的事情不想却突然遭…
艾莉森打算向警察坦白麦克所做的事，艾瑞亚极力反对。通过咨询斯宾塞母，艾瑞亚获悉麦克可能获刑。斯宾塞在母亲的安排下来到伦敦接受大学面试，A暗中在她的包袱里面放入血袋恐吓她。艾瑞亚找到塞莱斯，却发现他重度烧伤入院。因为艾莉森的缘故，选美主办方劝艾米丽退赛。
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