This is, apparently, the first in a series of "drop in and go" mini adventures, brought to you by Vigilance Press, who are offering up much awesomeness in their line of WWII PDFs.
Set in the waning months of the war, it is a last-ditch effort by the Nazis to bolster their numbers through the use of necromancy, raising the dead to become their new wave of soldiers. The main problem being that the dead hate the living.
This is mitigated by mind control helmets on the commanding officers, which work so long as nothing removes the helmet.
The scenario is played very loosely, setting up the situation, and dropping the PCs into it (the Allies have figured out that the Nazis are up to something at Castle Grunwald, and arrive to see zombie being pumped out en masse)...from there, the whole thing is left very open. The castle and its guards are described (such as the troopers on jetpacks in the air), with the PCs getting to handle it however they see fit.
Important details are listed, along with two Optional Details (one involving a mystical artifact and the other allowing for an explosive conclusion to the Battlescene), and none of them contradict the rest, so they can all be used together.
Additionally, a couple of plot twists are provided, in case the GM feels like everything is going too smoothly.
Two pages of stats are included, for the various zombies, as well as the sorcerers powering the machine, and an optional megazombie foe.
It is not a complicated scenario, at all...but it is not meant to be. For $1, you get a few stat blocks, as well as an encounter that could take up an entire short session, depending on how it plays out. Combined with the PC teams provided in the other PDFs in the series, it could make for a great ICONS demo, or just a cool diversion in your game.
Honestly, you could even use it outside of the WWII timeline just by twisting things a bit, and maybe having the man responsible be Count Fenrise (see Eugenics Brigade) having survived the end of the war and hoping to cause the Nazis to rise once more (this time from the dead). Definitely buy it if you're digging the other PDFs in this series, it's well worth your dollar.