The incidents described in the stories are modelled on Maugham's experiences as a secret agent, and "the central character, Ashenden, is very much an autobiographical character." He is supposed to have modelled Chandra Lal after Virendranath Chattopadhyaya, an Indian Nationalist in Germany during the war. Maugham, who was in the British Secret Service in Europe during the war, based a number of his stories on his own experiences. Among other enterprises, Britain's European intelligence network attempted to eliminate a number of Indian nationalists in Europe, notably members of the Berlin Committee. Donald Gullick, a British agent, was dispatched to assassinate Chattopadhaya while the latter was on his way to Geneva to meet another Indian nationalist, Mahendra Pratap and forward the Kaiser's invitation to Berlin. The short story of Giulia Lazzari is a blend of Gullick's attempts to assassinate Chattopadhyaya and Mata Hari's story. Winston Churchill reportedly advised Maugham to burn 14 other stories. (wikipedia.org)