PRETTY LITTLE LIARS – “unmAsked” – Rosewood’s Junior League Masquerade Gala is the perfect setting for “A’s” next game of cat and mouse with his/her favorite targets. But with Aria, Emily, Hanna and Spencer fast on his/her heels, will this game be “A’s” last? – on the explosive season finale of ABC Family’s hit original series “Pretty Little Liars,” airing Monday, March 19th (8:00 – 9:00 PM ET/PT).