In 1964, during the construction of an electric dam, a macabre discovery causes a serious incident. Thinking that the communication outage on the construction site is caused by a broken telephone line, Raymond and Fleurian are sent to the site to repair it. They will be the first to discover what really happened to the workers...
A retired public figure and history professor begins to lose his memory and must learn to be more discreet as he expresses himself.