"Der Zauberberg. Erster Band" by Thomas Mann is a novel published in 1924. Young engineer Hans Castorp visits his cousin at a Swiss sanatorium in the mountains before 1914, planning to stay three weeks. The isolated world of illness enchants him, especially when he encounters the mysterious Russian woman Madame Chauchat. Surrounded by eccentric patients and drawn into debates about philosophy, politics, love, and death, Castorp finds himself staying far longer than intended, spellbound by the sanatorium's strange atmosphere.