High tension against the majestic backdrop of the Appenzell mountains.

It was supposed to be the best day of their lives. But the romantic wedding in Appenzell suddenly turns into a nightmare when the groom falls to his death shortly after the ceremony. Milagros von Wirth, who was one of the guests, does not believe it was an accident, as the victim was an experienced mountaineer. She asks her son, private detective Max von Wirth, and his colleague Federica Hardegger for help, but they are unable to prevent further deaths - and Fede falls under suspicion of murder.