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|summary=Francis James Humbleton, the 'mediocre man' of the title is quiet and reserved, hardworking and a man of such regular habits that his neighbours can set their clocks by by his departure to work each morning. His life was unassuming, unnoticed by all but a very few and his death only came to light because his employers knew that something must be wrong when he didn't return to work after the Christmas break. Mr Humbleton had been murdered, at precisely (what else could it be?) 3am in what looked to be a burglary gone wrong. Only Mr Humbleton had nothing that was worth stealing and it's down to Detective Inspector Johnson and Detective Constable Smith to investigate his life as well as his death.