鈥楲assen the spy'. A Russian; described by the author as an espionage swindler. After a failed attempt to gain money in return secrets he did not have; Lassen was captured by Steinhauer and imprisoned for ten years. Lassen claimed to have gained money from both the English and French secret services.London: John Lane; 1930.From: Gustav Steinhauer; Steinhauer; the Kaiser's Master Spy. The story as told by himself. Edited by S. T. Felstead; etc. [With plates; including portraits.].010705. i. 35 plate opposite page 188London; British Library.