Semen Soroka, Maria Sayenko, Christina Higer, Eleonora Koval, Anna Strizhkova and Ivan Trofimovich. These are children – living witnesses to the war of 1939-1945.

Anna knows neither her birth date nor her real name, the others have lost their family and childhood, but they are all bound by one thing: they survived the terrible war – in death camps, ghettos, and captivity.

They were tortured, murdered by fascists, exterminated by police officers, branded, tortured in detention camps, humiliated by the KGB. They survived the terrible years of occupation, famine, and they suffered incredible suffering in the aftermath of the war. But no matter what, they survived and became children of victory.

The train, called the Route of Mercy, is bound by endless expanses. Hundreds of stops, big and small, hundreds of human destinies intertwine in this story.

The Mercy Route is a story about physicians who, following the Hippocratic Oath, are constantly trapped in tragedy-dramatic, comedic-detective situations, but always come out with dignity and honor.

The story unfolds in the first postwar year of 1946. The country was gripped by widespread hunger, poverty, quality and standard of living continued to "kill" the population. Law enforcement agencies are obliged to ensure the safety and inviolability of state bread, which means the application of extreme measures - arrest for 10 years or execution.

Captain Gnat Belov returns home after the service. On the train, he meets the criminal Sich, whom he has known since childhood. Many years ago, Sich and his young accomplices involved little Gnat in robbing a warehouse with stew. It turned out that Gnat rescued the Owl, who was trapped, but then their paths diverged. The owl is happy to meet and offers Gnat to take another risk, but he refuses. Suspecting that the "buddy" has planned something, Gnat decides to stop him ...