Through a series of secret agreements, the great German philosopher Friedrich Nietzsche and the Austrian doctor Josef Breuer, one of the fathers of psychoanalysis, meet in 19th century Vienna in an inspired process of dual psychotherapy. In this adventure of existential search, two unique individuals are involved: a young medical intern named Sigmund Freud, a tempestuous woman who is an idol of poets and psychiatrists, Lou Salomé, and a seductive patient, Anna O., who haunts the soul of her doctor. The famous psychiatrist Irvin D. Yalom imagines in this novel the meeting of two historical figures in the metropolis of intellectual ferment of the 19th century, Vienna, providing an interpretive account of the birth of psychotherapy and its relationship with existential philosophy. The therapeutic adventure that unfolds takes your breath away as it reveals step by step the healing power of true connection.