When the Bosnian Serb Gavrilo Princip assassinated the heir to the Austrian
throne in Sarajevo in 1914, he was just short of his twentieth birthday.
Under Austrian law, this meant that he was too young to be executed. He was
to spend the next four years in the garrison prison in Terezín, north of
Prague, and this was where he died just before the end of the war, the
result of tuberculosis and mistreatment. The little-known story of his
forced stay in what is now the Czech Republic was the inspiration for the
latest novel by the British writer, David