The discovery in 1972 of a key and human remains on an old well battered Warship at a Portsmouth breakers yard begins the long road to eventually unravel secret accounts of her many wartime exploits when her Commanding Officer John Tremain mounts audacious attacks provoking direct orders from an enraged Adolph Hitler to destroy him and his ship at any cost. Whilst in Occupied Norway Resistance fighters are desperately attempting to discover what the Germans are constructing inside a local disused Maritime College.
In spite of enemy agents causing loss of life and ships destroyed Tremain despite the overwhelming odds wins through to finally take his ship deep into a Norwegian Fjord on a rescue mission. With Resistance fighters, stolen secret documents and the Key aboard they felt safe....Or were they?