Dennis Detwiller is the co-creator of Delta Green, so it should be no surprise that I'm recommending this scenario. I'm actually unfortunate not to have played the game, but, even if you're also not familiar with the system, you should at least read this if you enjoy horror roleplaying or modern horror. I was intimidated, at first, by the adventure. It starts open-ended, with several important, though modifiable NPCs. A bumbling group of players can easily run afoul of them, making this a short scenario. However, experienced Delta Green roleplayers should enjoy the challenge of working closely with the authorities while maintaining their cover. Dennis Detwiller's own site has several free downloads and I'm going to check them out right now!
[5 of 5 Stars!]