Ernest Krause is a determined and ambitious person. At the beginning of the film, he achieves his cherished goal - he gets the command of a combat destroyer of the American fleet. He is now the commander-in-chief of the destroyer Greyhound and leads an international convoy of more than 30 ships. The first task becomes a kind of baptism of fire - Kraus will have to lead a convoy across the North Atlantic in conditions of pursuit by a group of German submarines. Will Ernest manage to fulfill his goal?