Sixteen-year-old Peter Rogers is training to be a Royal Navy officer in 1939 when he hears that his father's ship has been torpedoed off the coast of Ireland. The survivors, including his father, have been captured by a German U-boat crew and treated cruelly some of them are shot dead. In 1940 Peter joins an escort flee in the North Atlantic where British convoys are suffering horrific losses from enemy U-boats. We share in the trials and tribulations of his duties, including the constant tension, the bitter cold, mountainous seas - and the moment when he and his father's captor come face to face...