Trapped inside the Wild Hunt, Stiles reunites with an unexpected ally while Scott, Lydia and Malia discover Stiles's Jeep may be connected to his disappearance.
Stranded at a motel for the night because of the postponed cross country meet, Scott and the others suffer strange experiences that cause them to believe members of their own group may be the mysterious killer's newest targets.
With the threat growing far more personal and time running out on innocent lives, Scott is forced to make a difficult choice in order to save both friends and family while, at the same time, Derek and Peter try to figure out how to save Cora's life.
Under Deaton's advice, Scott and his friends use an ancient but extremely dangerous ritual to help them both save the lives of the people they love and stop Deucalion from achieving his sinister goal.