Two young talented neurosurgeons — Pyotr and Sasha — are enthusiastically working on a complex medical experiment. But in search of stability and a better life, Pyotr goes to work in Stockholm, Sasha becomes a major official. Pyotrr's overseas life does not add up, and he returns to Moscow. Realizing that his friend has a completely different life, Pyotr goes to Siberia, where he works on an ambulance. There he meets a girl with a brain disease, the study of which he had once been involved in, but did not finish the job. Feeling in vain of a lived, failed life, a sense of professional guilt in front of this sick girl, whom no one can help, torment him, and he again recalls his true destiny..