The Secret of Father Brown

JAMES BAGSHAW and Wilfred Underhill were old friends, and were fond of rambling through the streets at night, talking interminably as they turned corner after corner in the silent and seemingly lifeless labyrinth of the large suburb in which they lived. The former, a big, dark, good-humoured man with a strip of black moustache, was a professional police detective; the latter, a sharp-faced, sensitive-looking gentleman with light hair, was an amateur interested in detection. It will come as a shock to the readers of the best scientific romance to learn that it was the policeman who was talking and the amateur who was listening, even with a certain respect.

"Ours is the only trade," said Bagshaw, "in which the professional is always supposed to be wrong. After all, people don't write stories in which hairdressers can't cut hair and have to be helped by a customer; or in which a cabman can't drive a cab until his fare explains to him the philosophy of cab-driving. For all that, I'd never deny that we often tend to get into a rut: or, in other words, have the disadvantages of going by a rule. Where the romancers are wrong is, that they don't allow us even the advantages of going by a rule."

"Surely," said Underhill, "Sherlock Holmes would say that he went by a logical rule."

"He may be right," answered the other; "but I mean a collective rule. It's like the staff work of an army. We pool our information."