GreenMan Gaming’s The Hearts of Iron Mystery Bundle includes Hearts of Iron IV Cadet Edition + two mystery games
Hearts of Iron IV: Cadet Edition – Victory is at your fingertips! Your ability to lead your nation is your supreme weapon, the strategy game Hearts of Iron IV lets you take command of any nation in World War II; the most engaging conflict in world history. (also includes Poland: United and Ready DLC, Forum Avatar and Wallpapers)
Besides Hearts of Iron IV: Cadet Edition, get 2 more mystery Steam games in this bundle for a total of EUR 3.49. You can get the bundle here.
Some of the mystery games have been reported to be Fahrenheit Remastered, Frozen Synapse Prime, Russian Superhero Dead Ivan, Biozone and more.