A few weeks after Scott's pack came back from Mexico everything seems to be normal again, but soon they realize that there are new mysterious things going on in Beacon Hills. Especially Stiles has a lot problems, blackouts, panic attacks and weird dream are part of his day. As people go missing and Stiles is possessed by a really old evil demon, Scott's pack does everything to protect their friend and their town, but will they be able to stop the rising chaos?