This may be the third book in the reprinted series but was the first to be published in the original series back in the 1970s - hence its being set in 1940. Note to publishers - what the hell is a Tiger I doing on the cover in 1940?
Story introduces all the characters who will go through the series, the Butcher, the Vulture, and of course old Kuno von Dodenburg himself, a mere lieutenant in this one if I remember, and describes the storming of the Belgian fortress of Eben Emael which in fact fell to a paratroop attack I think.
If you like your war stories simple and your characeters stock - look no further. Useful table of UK, Wehrmacht and SS ranks in the original copy. Don't know if this is in the reprint.