Doctor Guido Tersilli, a young medical graduate in Rome, wants to open his own practice to repay his widowed mother's financial sacrifices. To make money, he joins a health insurance scheme where the more patients he has, the more he earns. However, he faces challenges with patients demanding unnecessary treatments.
With the help of his mother and fiancée Teresa, Guido starts his practice. He gains experience by volunteering in a hospital, impressing the head physician and nursing staff. Guido's aggressive approach to gaining patients, however, creates tension with his colleagues.
In a bid to secure a large number of patients, Guido befriends an elderly doctor, Dr. Bui, and pretends to fall in love with Bui's wife, convincing them to transfer all patients to him. Guido even changes clinics after Bui's death, leaving the widow behind.
Guido's life takes a turn when he meets Anna Maria, a wealthy woman he decides to marry. However, the stress of handling over 3100 patients causes Guido to collapse. Though his colleagues try to claim his patients, Guido recovers and continues his practice from home, instructing his nurse over the phone.