He did not arrive at this conclusion by the decent process of quiet, logical deduction, nor yet by the blinding flash of glorious intuition, but by the shoddy, untidy process halfway between the two by which one usually gets to know things.

In 1927 Margery Allingham married Carter who collaborated with her and designed the jackets for many of her books. Bibliography
Blackkerchief Dick (1923)
The White Cottage Mystery (1928)
The Crime at Black Dudley (1929) (US title: The Black Dudley Murder)
Mystery Mile (1930)
Look to the Lady (1931) (US title: The Gyrth Chalice Mystery)
Police at the Funeral (1931)
Sweet Danger (1933) (US title: Kingdom of Death/The Fear Sign)
Death of a Ghost (1934)
Flowers for the Judge (1936) (US title: Legacy in Blood)
Mr. At first Margery Allingham had to continue writing short stories and journalism for magazines such as The Strand Magazine but as her Campion saga went on her following and her sales grew steadily.