Commander Matson enters Czechoslovakia disguised as an art dealer, part of a plan to get atomic scientist Andrew Fleming out of the country. Tension mounts as the time of Fleming's trial nears and Matson has to call upon a group of Czech resistance fighters for help.

It is learned that a plan to kill Marshal Tito is afoot. Tito is placed under the guard of General Racz and his men. The only outsider allowed to see Tito is sculptress Sarah Fletcher. U.S. agent Blake Adams, assigned to guard Tito, learns that the plot is to be carried out very shortly.