In the department where anesthesiologist Agniya Smolskaya works, a young patient, Nina Mitina, dies during an operation. At first glance, the girl’s death occurred as a result of a medical error, but none of the team who performed the operation admits their guilt. And it soon becomes clear: Nina worked as a journalist and recently wrote articles specifically on medical topics. Meanwhile, the mother of an eleven-year-old boy contacts the Medical Investigations Unit. He recently had surgery and had one of his kidneys removed to check for Wilms' tumor. The hospital where the operation was performed refuses to give the mother tissue material to determine whether the diagnosis was made correctly. Agnia undertakes to help - it’s a piece of cake! However, it gradually becomes clear that Agnia’s new “easy case” and the death of her patient are connected...