In 15th Century Russia, the last Byzantium Princess, Sophia Palaiologina, moves from Rome to distant Moscow to marry Czar Ivan III. Destined to become the first influential female figure of the Russian Empire, Sophia overcomes court intrigue and betrayals, and helps Ivan consolidate the fragmented country, push Mongolian invaders out, and build the Kremlin, the most magnificent symbol of Russia.

When a train carrying atomic warheads mysteriously crashes in the former Soviet Union, a nuclear specialist discovers the accident is really part of a plot to cover up the theft of the weapons. Assigned to help her recover the missing bombs is a crack Special Forces Colonel.