Two scientists come to Gadgetville. They are taking part in a big folk song collecting competition. Whoever succeeds in recording the folk song of the world’s oldest animal species, the mythical fire-breathing dragon, wins the competition’s grand prize. The spirited girl dog Lotte and her little sister Roosi decide to help them. Exciting and unexpected adventures await.

This film is the third installment of the Lotte series made in co-production between Estonia (Eesti Joonisfilm) and Latvia (Rija Films). The only animated film in the frame of Estonia's centennial film programme has become one of the most viewed movies in the country. It was premiered at the Generation Kplus competition section of the 69th Berlin Film Festival.