The film tells the story of an attempted military coup in Spain on February 23, 1981. In 1975, the military dictatorship ended with the death of Franco, and King Juan Carlos returned to the throne, but the long-awaited new life did not come soon. At about 6 pm on February 23, 1981, the Spanish House of Representatives was voting on the prime ministerial candidate. At this time, about 200 armed civil defense officers surrounded the parliament building, and more than 300 members of parliament, including all cabinet members and major leaders of various parties, were all taken hostage.