故事讲述玫瑰镇（Rosewood Day）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。
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<听写方式: 填写缺失的部分, 不用带数字序号>
S:Who's next?
I spy with my little eye something that begins with "F."
Hey, Mr. Fitz.
H:Looking good, Mr. Fitz.
A:My turn.
S:　　　　　1　　　.
H:I would not want to see Mr. Gilardi on a bike.
E:I don't want to think of Mr. Gilardi in motion of any kind.
H:Ah. Mr. Fitz.
A:Hanna. Your turn.
S:You talk to Ben?
E:Nothing to talk about.
A:So you're really done?
E:It's okay. I'm fine.
A:Okay, if you say so.
H:　　　　　2　　　　.
All right, here it goes.
We are officially "A"-proofed.
S:Listen.
　　　　　3　　　　.
A:Yep, and none of them from "A."
E:This feels like a good thing.
H:Of course it's a good thing.
　　　　　4　　　　.
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There are teachers that you don't want to see on a bike, and there are teachers that you do want to see on a bike. I wish we had a drum roll for this. All those little messages zipping through the air all around us. Out of mind, out of sight.