A detective story set in a youth mountaineering club. One of the members, Ivan Kočička, nicknamed Kocour, single-handedly investigates the mystery of the body of an unknown man, which he discovered in a cave on top of a rock.
The leader of the fast-track workers' party is appointed worker director of the unprofitable Lucie mine. The wrong decisions he makes to increase production at any cost and to fulfil an unrealistic plan lead to a catastrophe in which his son is accidentally killed. After overwhelming criticism, the failed director wants to quit, but the senior management and party authorities continue to have faith in him...
