In 1815, Napoleon was taken to the remote island of St Helena in the Atlantic Ocean, a prisoner of the British. It had taken just a year for the monarchies of Europe, the anti-Napoleonic powers of the world, to destroy him. This final episode charts the fall of Napoleon, a key defining moment in global history. He trusted the Tsar of Russia - but the Tsar reneged on their deal. He sought revenge by invading Russia in 1812 - but the campaign was a disaster. He sought to defend France against her enemies - but made some grave, and ultimately suicidal military misjudgements.