Aldo Tammsaar

Police officer Jensen orders the evacuation of a leading media group's office building after a bomb threat is made. There won't be any explosion, however, the media group sustains big losses because of the work stoppage and the management requires investigation of the case. Officer Jensen identifies six suspects, then finds out that he is being followed himself, especially when he gets involved in the obscure activities of the mysterious 31st department.

It is the year 1947. The war is over but Estonian forests are still hiding armoured men. When the message comes that Western spies will arrive to support the local bushwhackers, security officer Rein Taim starts to lead the counter operation of the Communist Secret Police in order to catch the Western diversionists and the leader of the Estonian bushwhackers.

Sergeant Friman is developing an automatic submarine detector that piques the interest of both, Swedish and Russian spies.