When a killer who targets romantic partners every Valentine's Day mistakes them as a couple, co-workers Ally and Jay have a deadly date with destiny.

A full moon rises in Beacon Hills, and with it a terrifying evil has emerged. The wolves are howling once again, calling for the return of Banshees, Werecoyotes, Hellhounds, Kitsunes, and every other shapeshifter in the night. But only a Werewolf like Scott McCall, no longer a teenager yet still an Alpha, can gather both new allies and reunite trusted friends to fight back against what could be the most powerful and deadliest enemy they’ve ever faced.