An extraordinary criminal case in Piedmont. Corso Bramard lives in a village along the most beautiful hiking trail in the Alps. However, the residents are burdened by unsolved crimes. Bramard, as a commissioner, was on the trail of a female murderer. Just before the case was solved, his own wife became a victim, and his daughter disappeared. Twenty years later, the murderer contacts him again with an anonymous letter. Bramard accepts the challenge. He embarks on a quest to find the man who nearly destroyed his life, meticulously piecing together the fragmented memories of the valley's inhabitants over the last two decades, until a surprising encounter occurs in every sense.