Víctor, the engineer responsible for the Zapater nuclear power plant, joins his professional problems with an imminent divorce, a homosexual son and a new relationship. When a few days remain for the inauguration of the plant, an engineer very friendly to Víctor, guilty of a serious work-related accident and alcoholic, warns him of the possibility of a failure in the operation of the plant. Nothing guarantees the veracity of this warning, but to find out, the inauguration must be suspended.