<P> The Liars are told by Caleb that Mona has the board game and jump to conclusions that Mona is "A.D.". Mary meets with Spencer at Lost Woods Resort and gives her ownership of the building . Mona reveals that Charlotte never recovered and was going to resume the A-game . She confronted Charlotte and threatened to push her out the window but never planned to go through with it . When Hanna, Caleb and Spencer take Mona back to their car, the final two puzzle pieces are waiting . Later, the Liars gather in a room at the Lost Woods and put the two final puzzle pieces in . When the pieces are in place, the game says "Congratulations . Claim the grand prize", a picture of Archer . Augmented reality shows a man walking toward Aunt Carol's house . The Liars are arrested by Tanner at Aunt Carol's where Archer's body is found . Mary lies and says she killed Archer, also confessing to Jessica's murder, saving the Liars from a murder charge . Mona reveals that after she stopped threatening her, Charlotte attacked Mona and in the struggle she accidentally killed Charlotte in self - defense . </P> <Tr> <Th> 160 </Th> <Td> 20 </Td> <Td> "Till Death Do Us Part" </Td> <Td> I. Marlene King </Td> <Td> Story by: I. Marlene King & Kyle Bown Teleplay by: I. Marlene King & Maya Goldsmith </Td> <Td> June 27, 2017 (2017 - 06 - 27) </Td> <Td> 2M7220 </Td> <Td> 1.41 </Td> </Tr> <Tr> <Td_colspan="8"> <Table> <Tr> <Td> </Td> <Td> This episode's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (July 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> A year later, Ezra and Aria are getting ready to be married . Alison and Emily have twin daughters, named Grace and Lily . Alison proposes to Emily, who accepts . Before their wedding, Ezra suddenly goes missing, so the wedding is postponed . Spencer is kidnapped by Mona, who is back on the A-Team and working for "A.D." When Spencer awakens, she meets her secret twin sister, Alex Drake, who is revealed as "A.D." Alex explains that she met Wren at a bar in England, where he later introduced her to Charlotte, whom she had a close relationship with . She became "A.D." in hopes of avenging her death and also reveals that she murdered Wren, and turned him into an eternity stone . It is also revealed that Wren Kingston is the father of Emily and Allison's twins . Alex explains she has been impersonating Spencer and wants to take her place because she is in love with Toby . With help from Mona, who reveals she's playing to beat "A.D.", the Liars eventually find Spencer and Ezra struggling with Alex . Toby holds Spencer and Alex at gun point and realizes who the real Spencer is, and Alex and Mary are arrested . The Liars are gathered to see Aria off, when Hanna reveals she is pregnant . Aria reveals that she and Ezra are going to visit an adoption agency after their honeymoon . The girls exchange goodbyes and Aria leaves . In France, Mona has imprisoned Mary and Alex in a new Dollhouse, officially winning the "A" game . Meanwhile, Addison's friends are having a sleepover . When they awaken, they find that Addison has gone missing, with Willa saying "I think I heard a scream" and the series ends . </Td> </Tr> <Table> <Tr> <Td> </Td> <Td> This episode's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (July 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table>

Who is a in the last episode of pll
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