Subtitled: The Dirty Bomb Plot.
It is 1978. For the US there are two immediate problem spots: Iran and North Korea. The North Koreans have built dirty bombs and disguised them as furniture which has been shipped to a few US embassies, one of which is in Tehran.
Mike Cummins is tasked by the CIA to make sure that bomb does not go off, all while making sure the North Koreans do not learn the US knows about the plot.