Thomson, Basil: Queer People: Hunting Spies in World War 1 (1922); v1; 30 Sep 2019
 

During WW1 Sir Basil Thomson was Assistant Commissioner Crime at Scotland Yard, and his role was to liaise with MI5 and Special Branch searching out enemy spies.

(There is a fairly recent edition of this book which changed the title to "Odd People", for reasons which are probably apparent.)

I have added a handful of photographs: Thomson (frontispiece), Sir Roger Casement, Karl Lody, Mata Hari, and Rasputin; corrected the error in which the author (or the typesetter long ago) misspelled Mata Hari's name as Zeller instead of Zelle; and made up a cover, as I can find no dust jacket.

It's a good, lively read.