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So, we finally now know who A is.
Pretty Little Liars unleashed its biggest secret yet in last night's US episode, revealing that the Liars' tormentor is none other than CeCe Drake, played by recurring star Vanessa Ray.
Real name Charlotte DiLaurentis, CeCe was born Charles and wanted to wear dresses as a child - but her father refused to allow her and eventually sent her to Radley Sanitarium.
Charlotte's mother Jessica visited regularly, though, and bought Charlotte the same outfits she gave to Charlotte's sister Alison.
At Radley, Bethany pushed Toby's mother off the roof to her death and pinned it on Charlotte. The death was ruled as a suicide, after Jessica paid off Wilden.
When she was older, Charlotte was given permission by Radley to attend university classes. As CeCe, she met and dated her brother Jason - who didn't recognise her. Very twisted, but she did refuse to have sex with him!
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Jessica also failed to realise that CeCe was Charlotte, at least until they left for Cape May.
Charlotte wanted to tell Alison that she was her sister, but before she could, things got out of hand.
In a case of mistaken identity, Charlotte hit Alison thinking it was actually Bethany (who had earlier stolen Charlotte's clothes) about to hurt her mother. Oops.
Jessica, thinking Alison was dead, buried her. But Mona - wanting Alison gone - killed Bethany, thinking she was Alison. Double oops.
Charlotte had Wilden killed when he discovered that Alison was still alive. Oh, and Sara was the other Red Coat, as well as the Black Widow at Wilden's funeral.
Why did Charlotte become A? She was angry when Mona told her the Liars were happy Alison was gone. She also thought that, if Alison was really alive, her sister would show up if the girls were in trouble.
Did all of that makes sense? Well, in the present day, Charlotte tries to blow herself and Radley up by detonating a bomb. That fails, so she threatens to jump off the roof before being talked down by Alison.
Finally free from A, the Liars have a new threat to deal with. After a five-year time jump, the girls rush to Alison, warning her: "He's coming for you... He's already here."
Ray tweeted afterwards: "I'm overwhelmed that @imarleneking gave me this opportunity to play such a layered-tragic character. #roleofalifetime #CeCeIsA"
