Four Estonians who have escaped to Sweden during the war return to the Soviet Estonia in 1950s. The four diversionists are hired by the Western Secret Service. Difficulties arise when they cross the border with an injured companion - the rest of three have to decide what to do next. Soviet reality is not something they have expected and cooperation with the local people won't be any success. The agents must risk their conscience, their families and lives. National Security will launch its counter operation full of exciting turns.