The film depicts the difficulties of preparation and the dramatic stages of the conquest of McKinley (6190 m), for the inviolate south face, carried out by a C.A.I. Lecco expedition in 1961 led by Riccardo Cassin. McKinley, the highest mountain on the North American continent, was named at the time in tribute to a U.S. president; in 2015, however, Obama restored its original toponym, Denali, by which it is now known.  (Credits: Catalogo CAI, https://www.cai.it/titolo/la-sud-del-monte-mckinley/)