Richard Horatio Edgar Wallace (1 April 1875 – 10 February 1932) was an English writer
Born into poverty as an illegitimate London child, Wallace left school at 12. He joined the army at 21 and was a war correspondent during the Second Boer War for Reuters and the Daily Mail. Struggling with debt, he left South Africa, returned to London and began writing thrillers to raise income, publishing books including The Four Just Men (1905).
“The Man Who Knew” is another nice convoluted story from Wallace. A memory expert, murder, an inheritance, bigamy, kidnapping, drugs, corruption and all the usual Wallace ingredients go to make up a story that is pure Edgar Wallace from start to finish.