Mr. Evans mopped his eyes, and Inspector Seldon took upon himself to reply for him.  “He has a brother-in-law in the trade at Hampstead—­keeps the Three Jugs in Coulter Street.  Evans had to go out to see his brother-in-law on business, and his brother-in-law took him along to the court out of curiosity.”

Inspector Chippenfield nodded.

“Rolfe,” he said, “take down Mr. Evans’s statement outside and get him to sign it.  Don’t go away when you’ve finished.  I want you.”

Mr. Evans, even if he felt that full justice had been done to his story by Inspector Seldon, was disappointed at the police officer’s failure to do justice to his manly scruples in coming forward to give evidence against a man who had never done him any harm.  Addressing Inspector Chippenfield he said: 

“I don’t altogether like mixing myself up in this business.  That isn’t my way.  If I have a thing to say to a man I like to say it to his face.  I don’t like a man to say things behind a man’s back, that is, if he calls himself a man.  But I thought over this thing after leaving the court and hearing this chap Hill say he hadn’t left home that night, and I talked it over with my wife—­”

“You did the right thing,” said Inspector Chippenfield, with the emphasis of a man who had profited by the triumph of right.

Mr. Evans was under the impression that the inspector’s approval referred chiefly to the part he had played as a husband in talking over his perplexity with his wife, rather than the part he had played as a man in revealing that Hill had lied in his evidence.

“I always do,” he said.  “My wife’s one of the sensible sort, and when a man takes her advice he don’t go far wrong.  She advised me to go straight to the police-station and tell them all I know.  ‘It is a cruel murder,’ she said, ‘and who knows but it might be our turn next?’”

This example of the imaginative element in feminine logic made no impression on the practical official who listened to the admiring husband.

“That is all right,” said Inspector Chippenfield soothingly.  “I understand your scruples.  They do you credit.  But an honest man like you doesn’t want to shield a criminal from justice—­least of all a cold-blooded murderer.”

When Rolfe returned to his superior with Evans’s signed statement in his hand, he found the inspector preparing to leave the office.

“Put on your hat and come with me,” said the inspector.  “We will go out and see Mrs. Hill.  I’ll frighten the truth out of her and then tackle Hill.  He is sure to be up at Riversbrook, and we can go on there from Camden Town.”

While on the way to Camden Town by Tube, Inspector Chippenfield arranged his plans with the object of saving time.  He would interview Mrs. Hill and while he was doing so Rolfe could make inquiries at the neighbouring hotels about Hill.  It was the inspector’s conviction that a man who had anything to do with a murder would require a steady supply of stimulants next day.