In the midst of the breathtaking landscape of South Tyrol, detectives Matteo Zanchetti and Sonja Schwarz must investigate the death of a retired judge who was shot in his own home. Soon, they are on the trail of a series of burglaries, where alarm systems are mysteriously disabled. Then, a dead worker is found in the marble quarry. But who is behind all of this? And what role does the mafia boss Francesco Rossi play?.