Lina Tomashevskaya had to undergo emergency heart surgery. In the intensive care unit, she involuntarily hears an argument between Dr. Mukhina and a colleague. The doctors were interested in a patient who had recently been transferred to another department. Still under the influence of anesthesia, Lina forgets about the strange conversation, but soon meets an elderly widower, a retired diplomat and a pleasant conversationalist. Suddenly, the diplomat disappears from the clinic, leaving Lina with a very strange assignment. What made him urgently leave the hospital? What is the reason for the strange deaths in the clinic? Lina and her longtime friend Valery Bashmachkov begin a dangerous investigation...Contains obscene language.