The crew cross the Atlantic many times on escort duty in all kinds of weather, often encountering fierce storms in one of the smallest ships built to protect Allied convoys. The men endure the ship's constant rolling and pitching in the huge waves, freezing cold, the strain of maintaining station on the convoy on pitch-black nights and the fear that at any second a torpedo from a German U-boat could blow them to oblivion. Somehow the tradition of the Royal Navy and the knowledge of the importance of their work carries them through.