PFC Molnár decides his WWII services are over, and with serious money hidden in his hand grenades, he heads to an abandoned mansion where he encounters not only the sour butler but a bunch of others who also try to wimp out of their duties.

Three people – a returned prisoner of war, his beautiful second wife, and the possessive, hunchbacked spinster who is his sister-in-law by his first marriage – are isolated in a little house under an extinct volcano, where each strives for personal happiness but is suffocated by their dependence on the others.

In 1948, when Hungarian industry counts on almost every liter of fuel, the production of Makert, an American oil company in Hungary, is declining by the day. The firm's American owners claim that the oil field is depleted. However, the new government controller, Nerges, discovers that this is sophisticated sabotage by which representatives of American industrial circles want to disrupt socialist construction in the country. With the help of Hungarian state security officers, Nergesz uncovers and neutralizes the saboteurs at the mine and hastens the Hungarian people's decision to nationalize Makert.