At the height of the Cold War, a troubled soldier forms a forbidden love triangle with a daring fighter pilot and his female comrade amid the dangerous surroundings of a Soviet Air Force Base.

Four children - Mari, Sadu, Olav and Anton form a secret society to play hide-and seek games invented by Mari's grandfather, a professor at the university. When the city is attacked by a mysterious poison which turns adults into children our gang embarks on a quest for the antidote.