Scott, Malia, & Stiles scramble to find a way to save Sheriff Stilinski from an unknown toxin while Liam & Mason search for the whereabouts of Hayden's body and the other dead chimera bodies.
After finding out that Lydia is in danger, Stiles makes a plan to break her out of Eichen House; Theo has his own plans as he joins Deucalion in a quest to kill Scott.
The Pack are trying to figure out how to defeat the Beast of Gévaudan that the Maid of Gévaudan, Marie-Jeanne Valet, faced in 1765. As Gerard Argent, recounts Valet's story to Scott's pack in hopes they can deduce the creature's weaknesses.
Chris Argent and Malia Tate protect the others that were marked by the ghost riders. Scott, Liam, Hayden, Mason, and Corey help protect the lacrosse team from the ghost riders while Lydia tries to find clues about Stiles.
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.