It is 1939. The Royal Navy urgently needs information about German raiders. There is only one place to get it - the port of Narvik and only one man capable - Magnusson. A story of the daring, outrageous exploits of a spy rescuing British prisoners from the Altmark and swept up in to the German battle for Norway.
From Wikipedia: John Harris was a British author. He published a series of crime novels featuring the character Inspector Pel, and war books. He wrote with his own name, and also with the pseudonym of Mark Hebden. His 1953 novel The Sea Shall Not Have Them was the basis for a feature film of the same name in 1954. He was the father of Juliet Harris, who published more Inspector Pel books under the name of Juliet Hebden.