From the introduction:
The 3rd of August, 1944.
It going bad for the Wehrmacht: Americans bomb German industry into gravel. The British firebomb the civilian population. The Allies invaded Normandy three months ago and the Red Army has blown open the eastern front. They have reached the outskirts of Warsaw and Belgrade.
A month ago an Abwehr agent intercepted a coded Russian telegram, though the dedicated courier managed to eat half of it before he died. The telegram mentions a top-secret project called Katusja. The project is managed by a Professor Frank. According to the telegram, the project is completed. The telegram also mentions a special train departing from the Kiev Railway Station, track no. 4, at 18.00, Aug. 3...