When Aria, Spencer, Emily, Hannah, and Alison both reunite in Rosewood, Spencer deranged twin Alex and her biological mother, Mary Drake have both escaped from Mona's dollhouse with the help of Jenna. She wants revenge on Spencer and the girls by playing a game called, "The Bonus Round" which get them into dangerous situations and life or death challenges. Also more secrets will be revealed that could tear their friendship and their relationship with their love ones apart. And on the "Final Round" one of them will not make it.. alive.