The Middle Temple Murder by J. S. Fletcher [republicV]

Joseph Smith Fletcher (7 February 1863 - 30 January 1935) was a British journalist and writer. He wrote more than 230 books on a wide variety of subjects, both fiction and non-fiction. He was one of the leading writers of detective fiction in the "Golden Age".
Fletcher was born in Halifax, West Yorkshire, the son of a clergyman. He was educated at Silcoates School in Wakefield. After some study of law, he became a journalist. His first books published were poetry. He then moved on to write numerous works of both historical fiction and history, many dealing with Yorkshire, which led to his selection as a fellow of the Royal Historical Society. In 1914 he wrote his first detective novel and went on to write over a hundred, many featuring the private investigator Ronald Camberwell.
He was married to the Irish writer Rosamond Langbridge, with whom he had one son.
From Wikipedia

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Spargo lived in Bloomsbury on the west side of Russell Square. Every night and every morning he walked to and from the Watchman office by the same route-Southampton Row Kingsway the Strand Fleet Street. He came to know several faces especially amongst the police; he formed the habit of exchanging greetings with various officers whom he encountered at regular points as he went slowly homewards smoking his pipe.