Metskannikesed (1980)

After WW-2 the Estonian forests are full of armed groups - the forest-brothers who carry on the fight against communism. Soviet secret police sends spies among them. The spies are sent under top secrecy, so no-one actually knows who is who. This is a game of cat and mouse, waiting a weaker to make a mistake. For remark, this is a Soviet spy film with adequate moral.