The Sõpruse bridge connecting Russia and Estonia suddenly plunges into darkness. When the lights come back, in the middle of the bridge, on the borderline, a body is discovered. A joint Russian-Estonian investigation is appointed. Russian investigator Maxim Kazantsev and Estonian inspector Inga Veermaa will investigate a chain of crimes that are well prepared, masterly executed and contain “messages” on the topic of social injustice..