In an isolated observatory perched on the dangerous peak of Mont Blanc, a scientist works in courageous isolation in this classic "mountain film" from director Arnold Fanck, known for his invention of the genre. Hannes (Sepp Rist) maintains connection to the world below only through the visits of a stunt pilot (Ernst Udet, playing himself), who one day brings beautiful astronomer Hella (Leni Riefenstahl) along with him. When she later visits the observatory, Hella and Hannes fall in love, but when she visits his musician friend, Hannes becomes convinced they are lovers and signs on for another year in the observatory. When Hannes loses his gloves in the middle of a storm, danger is imminent, and a Morse Code message to Hella is his only hope. She sets out into the storm, determined to save him, while her elderly father (Friedrich Kayssler) with whom she lives, suffers from failing health.