In central Brussels stands a statue of a young woman. Built in 1923, it is the first monument to a working-class woman in European history. Her name was Gabrielle Petit. History has forgotten Petit, an ambitious and patriotic Belgian, executed by firing squad in 1916 for her role as an intelligence agent for the British Army. After the First World War she was celebrated as an example of stern endeavour, but a hundred years later her memory has faded....