VIDEO: Sneak Peek: Tonight's PRETTY LITTLE LIARS' #fAtaleFinale

It's the Pretty Little Liars summer finale you do NOT want to miss! Don't forget to tune in to ABC Family TONIGHT for the #fAtaleFinale of PRETTY LITTLE LIARS! As the liars feel trapped and desperate, Alison builds her own army now that the PLLs have turned their back on her. Also, catch up on the entire summer season with an all-day marathon of Pretty Little Liars until tonight's finale. Check out a preview of the summer finale below.

On tonight's episode, with Alison leading them down a dangerous path and "A" barring them from telling the police the truth, Aria, Emily, Hanna and Spencer feel trapped and are desperate to find a way out of this mess. With nothing else to lose, could the PLLs lose everything by putting their faith in a possibly untrustworthy ally? Meanwhile, Alison begins to build up her own army now that the PLLs have turned their backs on her.

VIDEO: Sneak Peek: Tonight's PRETTY LITTLE LIARS' #fAtaleFinale