Operation Fortitude

Allied planners created fictitious armies, false radio traffic and controlled double agents to persuade German commanders that the principal invasion would land at the Pas-de-Calais rather than Normandy.

Physical decoys and misleading intelligence reinforced existing German expectations. The deception continued after D-Day to delay the movement of reserves.

Eye of the Needle imagines the consequences if a German agent discovers that the invasion force in south-east England is largely an illusion.