Scott and Malia get help to try to find Hayden and Liam. Deaton discovers something horrific about the dread doctors. Hayden and Liam will be faced with a life and death situation.

As Scott tries to put his pack back together, Malia and her new ally set out to rescue Deaton from The Desert Wolf.

Scott and his pack use a charity lacrosse game in a deadly gambit to figure out the identity of the Beast.

With the identity of the Beast finally revealed, Scott and his friends are in a race against time to stop The Dread doctors from implementing their final plan.

Loyalties are tested and new alliances forged as Scott and his friends work to stop the Beast before Beacon Hills is razed to the ground.