Budapest, Hungary, Christmas 1957. The state, insecure after the defeated revolution of 1956 and increasingly put under the influence of a renewed Stalinist atmosphere, has decreed that all security officials must pass an exam to verify their loyalty. But to be actually effective in a shadowy world where suspicion and secrets reign, the subjects must be unaware that they are being tested.

Divided into four sections, "Song" is inspired by the Siberian and Finno-Ugric legends about Creation, in which the world begins with characters who are only half-human, one being half-bird, the other half-bear. The narrator delves into the origins of Hungarian culture, the Iranian and Turkish influences that impacted the society, and finally the story of Stephen, the emperor who brought Christianity to the country and shifted the capital west in an attempt to link with Europe.