There are mysterious murders in the area of ​​Lake Balaton. These places are shrouded in secrecy and constantly attract hunters: during the Second World War, the Germans had hidden a huge treasure here. Investigation of the murders entrusted to Major Kardos. He takes up the case, but in search of treasure he had many competitors. Kardos uses help from his loyal friend - a policeman-superman Etvash aka "Droplet".

The continuation of the series about the adventures of Major Kardos and former police Lieutenant Droplet who are busy now with an investigation of an European drug cartel which operates across Greece, Hungary and Germany.

Lint and his lover are sailing and making fun absent-mindedly at Lake Balaton when the anchor suddenly gets stuck in a bomb in the mud. Lint gets hurt while fussing about under the water. A strong storm breaks out when they reach the shore. In the local restaurant the man recalls his memories of war.

The preparation, in Hungary, of the assassination in Marseilles of King Alexander of Yugoslavia in 1934.

1972 film directed by Miklós Jancsó