Tallinn, Estonia, days before outbreak of World War II. Hotel detective and Polish writer team up to find Tear of the Prince of Darkness, a legendary ring which can bring Satan’s rule over the world.

Mermaids and humans have crossed paths throughout millennias.Their generally peaceful coexistence is described in naiadological literature, as well as in the folklore of many nations. Our mermaid people are poetic and mysterious - we meet these gentle and femininely charming creatures in nature and in the everyday life around us. The film follows the principles of scientific lyricism, and takes the viewer through the history of naiadology and introduces the main types of mermaids. The mermaids were captured in beautiful places in Estonian waters.