Pretty Little Liars: The Case For Mona "Over the course of almost 50 episodes, the mysterious A has wreaked a serious amount of havoc (blackmailing therapists, faking suicide notes, attempted vehicular manslaughter, etc.) and the Liars have burned through just as many potential culprits. Except, that is, the one person who probably should be at the top of the suspect list: queen bee Mona Vanderwaal."

Pretty Little Liars: The Case For Mona 
"Over the course of almost 50 episodes, the mysterious A has wreaked a serious amount of havoc (blackmailing therapists, faking suicide notes, attempted vehicular manslaughter, etc.) and the Liars have burned through just as many potential culprits. Except, that is, the one person who probably should be at the top of the suspect list: queen bee Mona Vanderwaal."