SPIES OF THE AIR is a low rent British thriller, filmed just before war broke out in 1939. Thus the baddies remain unnamed although everybody knows who they are. The story is slightly similar to Hitchcock's must better SABOTEUR, as everybody's on the hunt for someone selling secrets to the enemy. As a thriller it's a dated affair that feels like it comes from a different world; it's chiefly of interest for featuring a pre-stardom David Lean as editor, but that's not much to recommend. A serviceable drama with a few good moments, but forgettable overall.