A new book published in Germany says the murder of six million Jews in the Second World War was due to Hitler's belief that they "stole" victory from the country in the First World War.

"In his madness Hitler was convinced that the 'Jewish poison' had done the same thing to his beloved Germany in 1918 what the 'cancer poison' had done to his beloved mother in 1907," wrote historian and journalist Dr Joachim Riecker.

'November 9: How World War One Led to the Holocaust' examines the speeches both public and private of Hitler to try to solve the riddle of how a dictator could morph into the industrial-scale murderer of an entire people.

Dr Riecker discounts previously held theories that Hitler began hating the Jews because a Jewish doctor called Eduard Bloch unsuccessfully treated his mother Klara.