La Légion étrangère, Groupe de Reconnaissance 17/8, 1916, Shar Highlands in Bulgarian occupied Serbia

This is a bit preliminary. This will be 7e Call of Cthulhu, which is a rulebook I do not have yet. I'll buy it. Of course, I already have 5e, so if everyone has that, we could use that instead. It'll be set in The Great War, in the Shar mountains.

As for the game, a detatchment of the French Foreign Legion has been deployed to a border region, right on the front lines, to keep open a telegraph line. So you're sitting on a mountain top, in the remains of an old monastary, with Bulgarians, Austro-Hungarians and Imperial Germans on one side, ragtag bands of Greek and Serbian irregulars on the other, and Shar separatists crawling in all the cracks. 

The telegraph line is tentative at best, but vital: It connects Serbian remnants with the rest of the world, and connects allied command with Greece, who remain neutral officially, but have insurgent forces fighting for the allies. The telegraph goes south through Bulgarian occupied Macedonia, but the line itself is kept secure by rebels, and west through Austro-Hungarian occupied Albania, but here kept secure by Serbian troops in exile. 

The situation isn't really viable long term, and just to make matters worse, you haven't had any orders for months. You can listen in to Rome communicating with Athens, but your own regimental HQ hasn't been in touch for a long time. And just to make things even more fun, two weeks ago Captain Adrien de Rochefort, your commanding officer, took the motorcycles and a few men, and tried to reach HQ. He hasn't been heard since either.

Meanwhile, the Bulgarians may possibly not know how weak the defence of this telegraph line is. But that's not going to last forever. 

If you're sufficiently curious, the monastary is just south of Zërnovskë, with a majestic view of Lake Prespa. The game is not, however, any more than loosely based on actual events of the war, or where troops and front lines were at the time.