Wild Sign (Alpha and Omega, Book 6) by Patricia Briggs

In Patricia Briggs' "Feuerkrone," the residents of a small Californian mountain village disappear overnight, prompting the FBI to turn to the owner of the land, a company called Aspen Creek Inc. Little do they know, Aspen Creek is actually owned by none other than the Marrok himself, the most powerful werewolf in the world. He sends his son, Charles, and his mate, Anna, to California to investigate.

As Charles and Anna delve into the mystery, they uncover a terrifying creature lurking in the California wilderness, surpassing their worst fears. The pair must use all their skills and courage to confront this ancient evil and protect the world of humans and werewolves alike.

"Feuerkrone" is a thrilling tale of mystery, suspense, and supernatural intrigue. Briggs' expert storytelling and richly developed characters will keep readers on the edge of their seats until the very end.