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Edward Powys Mathers: Cain's Jawbone (Paperback, 2021, Unbound)

Six murders. One hundred pages. Millions of possible combinations. . . but only one is …

My slight experience of detetive-sergeants is that they have a mannerl but no plural. If you use a word of more than two syllables to them they think you are laughing at them. They are, to that extent, acute.

Cain's Jawbone by  (Page 59)

1930s cryptic puzzle book says acab