Günter Grass, novelist, poet and human rights campaigner, died in April aged 87. He was called the conscience of Germany, or more accurately West Germany. But at the heart of both the writer and the state lay a dark secret that has haunted his reputation. He was born in 1927 in the “free” city of Danzig, a port between Germany and Poland, today Gdansk in Poland. Its free-ness was a state given after the First World War as a price paid by Germany for its defeat.