The title tells it all. Sir Basil Thomson was (among other things in a long, complex career in foreign service, as well as policing) one of the "Big Four" (Assistant Commissioner Crime) at Scotland Yard in the late 20s and early 30s, when Edgar Wallace's crime writing career was winding up and Agatha Christie's just starting.
He tells the story of how the Yard came into being, its early vicissitudes, the creation of the detective force, and the progress through WW1 and into the mid-thirties.
Source: Internet archive .txt file and pdf.
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