In Berlin, he was named Levi: a good Jewish dog with a good Jewish name.

When his owners fled to America, he became Hercules: star of the silver screen in Hollywood's golden age.

Then he caught the eye of Hitler, who called him Hansi: a pure-bred lapdog, privy to all the Führer's secrets.

But he was known to the Resistance as Sirius: the insider who could bring peace to a world at war.

SIRIUS: the little dog who almost changed history.