After the hunters defeat, everything seems to come back to normal in Beacon Hills. As the adults of the pack leave for college, Liam is left in charge. With his friends Mason, Corey and Alec the boy they saved, he intends to keep the city under controll. When two girls of a new kind come in town, the young beta tries to befriend them but find out that someone already has : Theo the boy who betrayed him and saved his life.