Convoy of ships en route to Russia makes its way through the danger belt north of Scandinavia.
Titles read: "CONVOY TO RUSSIA".
Somewhere in Scandinavian waters.
Various shots of ships in a large convoy en route to Russia. Gun crews go into action on escort ships and open fire on attacking enemy planes as they pass through the "danger belt north of Scandinavia". Aboard the cruiser 'Scylla' Lieutenant-Commander McKean in a fur hat keeps a running commentary on the battle for the benefit of the ship's company.
A column of black smoke rises into the sky after one of the ships is hit. The Scylla draws alongside the minesweeper 'Harrier'. The two ships are lashed together while travelling at speed as the Scylla and takes on survivors of a torpedoed freighter.
The escort Commander, Rear Admiral Burnett, is put in breeches buoy and slung across to a destroyer so the Scylla can go ahead with survivors. C/U of Burnett on a ship, smiling and looking through binoculars.