How PLL should've ended
Spencer finds herself locked up in a high tech prison underground and finds that a bloodied Ezra is locked up also, in a separate cell. He starts to tell her that he has to get out and hurry up to get to Aria He pretends to struggle at first but then, he pushes his cell door open with ease. Spencer is equally horrified and baffled.
“Spencer, you were always the smart one. You found out it was me, and you were about to tell Aria. But I can’t let you do that.”
He reveals that he is the real A.D. Assuming a different alias with Aria (unknowingly) being his accomplice. He is obsessed with toying with/torturing young girls - especially Ali. He discovered Aria’s multiple personality disorder early on and decided to use it to get in the girls’ inner circle. He reveals that he has poisoned Aria so that she would be barren. He intends to take the Emison girls as his and Aria’s own, and he is the sperm donor.
As Ezra is speaking, he looks back and finds Spencer’s cell is empty. She lunges a knife from the underground bunker into his back and we see his body fall.
“Deux peuvent garder un secret si l'un d'entre eux est mort… Two can keep a secret if one of them is dead.”
The last scene is the group of girls at an outdoor funeral for Ezra. After the other girls have left, Aria (now a “widow” in black) is crying with both sadness and anger. She hears rustling by a nearby tree. When she looks over, Ezra in a black hoodie puts his finger to his face as if to say “shhhh”. Aria returns this sign, except directly to the camera. Fade to black.