After Alison is stood up to with a sudden, baffling risk, the Liars choose to take things into their own particular hands for a counterattack. Hanna and Caleb cooperate to build up an arrangement to encounter the tormentor. Emily and Spencer collaborate to examine if Mona had any inclusion with the murder. Aria and Ezra keep on working on the book however it may be more troublesome than expected.
In the mean time, Ali experiences an unforeseen guest.