Question: when do you find out cece is red coat

title: Red Coat (Pretty Little Liars)
text: In the fourth season 's mid-season finale `` Now You See Me , Now You Do n't '' , the Liars head to Ravenswood to look for Red Coat . While there , Red Coat kidnaps Emily and locks her in a coffin on a Sawmill . The Liars witness Red Coat heading to that Sawmill and chase her inside , where she actually stops the saw and another Red Coat , donning a mask of Alison 's face , appears on the stairwell , revealing that two people have been sporting the disguise all along . Spencer follows the Red Coat who saved Emily , while Aria fights the masked Red Coat and unmasks her as CeCe Drake . The Liars manage to catch the Red Coat who saved Emily in the ending of `` Grave New World '' , who reveals herself as an alive Alison . During `` EscApe from New York '' , Ali claims that she asked CeCe to wear the disguise to distract `` A '' and that CeCe was never truly Red Coat . It is later revealed that CeCe actually was the Red Coat who stole the game from Mona and wore the disguise during her schemes , presumably until the saw mill incident . In `` Game Over , Charles '' , the Liars learn there was a third Red Coat who posed as a decoy for CeCe and used the infamous disguise to distract the Liars whenever CeCe could n't . The third Red Coat is revealed to be Sara Harvey . 

Answer: answer: During the Sawmill incident, Aria fights the masked Red Coat and unmasks her as CeCe Drake.  It is later revealed that CeCe actually was the Red Coat who stole the game from Mona and wore the disguise during her schemes.