The book "The Tectonometamorphic Evolution of the Friningen Peridotite Lens" offers a comprehensive analysis of the geological processes occurring in the Scandinavian Caledonides. This eroded mountain range, stripped of its sedimentary cover, allows for the examination of processes in the middle and lower crust during the orogenic cycle. In particular, the Friningen Garnet Peridotite Lens, located in the high-pressure central belt of the Seve Nappe Complex, is studied in detail. Utilizing various methods, including optical and electron microscopy as well as geochemical analyses, the tectonometamorphic evolution of this lens is explained in the context of the Caledonian orogenic cycle. The results indicate that the early Caledonian metamorphism of the Seve Nappe Complex is attributed to a continent-continent collision.