Die Nagelprobe.

Young archaeologist Nina never imagined that finding a medieval object in a reed bed in the Obwalden municipality of Giswil would turn her life upside down. And Baggel-Rot, Brandi-Guchs, Bichel-Botsch, Buggel-Wyyss, and Mattli-Latz would never have dreamed that it would end like this, back in Torenberg's time, when they set out on Good Friday night in 1381 to save Obwalden's honor and teach the Entlebuchers a lesson.