Espionage is as much a part of warfare as infantry or artillery. Knowing what your enemy is planning is a great help when it comes to stopping him. But all the time you're watching him, he's watching you, isn't he? Which is why you need spy-catchers, men who will sniff out the spies and neutralise them. British Army lorry-driver Arnie Kershaw loved to read about the adventures of such men... but even he never dreamt for a moment that he'd be caught up in their activities for real.
