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Niklas Frank has spent his life trying to atone for the war crimes of his father, a senior Nazi.

Niklas was born in 1939 which was the year Germany invaded Poland and provoked the Second World War.

His father Hans Frank was made governor of occupied Poland, and was responsible for the extermination of millions of people in death camps.

At the end of the war Hans Frank was captured by American troops and in the Nuremberg trials was found guilty of committing war crimes and crimes against humanity.

He was executed. Niklas was seven at the time of his father's death. He went on to become a journalist for the respected Stern magazine and in 1987 Niklas published a book viciously attacking his father.

Only one of Niklas' four siblings supports him in the stance he has taken, spending the last two decades touring Germany talking to young people about the horrors of Nazism.

Recently he took his message to Nagold, a former Nazi stronghold in south-west Germany, and on the way told Outlook's reporter Alfonso Daniels that he has never got over the shock of discovering the truth about his father.