Based on true events.
1942. The war at sea is being lost. One per cent of all naval personnel are being referred as psychiatric casualties. The British Admiralty introduces the Stone Frigate approach.
Three men fight for their country in the horrors of the Arctic Convoys, then for their sanity and dignity, labelled as cowards and subjected to experimental psychiatry at an isolated facility set up to by the British Admiralty to recycle men back into battle.