Question: who is a on pretty little liars season 6

title: Pretty Little Liars (season 6)
text: Determined to give the unexpected scholarship money back , Hanna is willing to risk losing her chance at going to her school of choice . Alison learns more about her brother which , in turn , finds it difficult to connect a murderer to the little boy she has seen in photos and her memories . Meanwhile , Rosewood High is considering not letting the Liars attend their senior prom due to high risk security issues . Charles and Red Coat are seen in a room , watching the gallery display and plotting to sabotage Aria 's work . They succeed , and humiliate Aria by displaying a gruesome picture of Aria , Emily , Spencer , and Hanna in the morgue while they were trapped in the dollhouse . Aria is devastated and finds comfort from Ezra . Meanwhile , Hanna and Spencer visit a man named Rhys Matthews to inquire Hanna 's scholarship money and are stunned to notice how similar Rhys is to Jason , as they believe Rhys to be Charles . The Liars , except Aria , follow Rhys to an abandoned dollhouse where they find him working with Clark . When they inform Aria about what they saw , she is disillusioned . Red Coat is seen eavesdropping on Ashley and Ella . '