A brilliant German agent lies in wait for the allied invasion of Nazi-occupied France. While the allies prepare a vast armed camp, no one is aware of the enemy within, and when a sudden, deadly E-boat attacks, the Fox strikes, stealing secret invasion plans in the ensuing panic. What follows is a deadly pursuit as the Fox tries to get the plans to Germany in time, hotly pursued by two officers with orders to stop him at all costs.
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.
Unusual spy hunt drama set in the prelude to D-Day in 1994. An interesting tale with some good characters. I picked it up thinking it was a land-based Douglas Reeman story but it wasn't.