It is the 1980's, and the Cold War between the Western Bloc (led by the USA) and the Eastern Bloc (led by the Soviet Union) is at its peak. The town of Ostnitz is located on the border between the fictional Eastern Bloc nation of Frobnia and the equally fictional neutral Litzenburg. The US ambassador is about to arrive in Ostnitz in order to deliver a speech on the occasion of the local Constitution Day. However, a plot to assassinate the ambassador, hence escalating the tension between the super-powers, is soon revealed.
Border Zone is a text adventure game in which the player controls three different protagonists throughout three chapters: an American businessman and two special agents - a Western and an Eastern one. Besides the traditional text-based exploration and puzzle-solving, the game has real-time elements: time passes even if the player does not interact with the game. Some stealth-oriented sequences rely on these elements, timing being crucial to advance.