“Stop it!” shouted Mr. Cooper.

“I won’t,” said Mr. Simpson.

The noise became unendurable.  Mr. Cooper, who had just lit his pipe, laid it on the table and looked round at his companions.

“He’ll have the door down soon,” he said, rising.  “Halloa, there!”

“Halloa!” said the other.

“You say you’re Bill Simpson,” said Mr. Cooper, holding up a forefinger at Mrs. Simpson, who was about to interrupt.  “If you are, tell us something you know that only you could know; something we know, so as to identify you.  Things about your past.”

A strange noise sounded behind the door.

“Sounds as though he is smacking his lips,” said Mrs. Cooper to her sister-in-law, who was eyeing Mr. Cooper restlessly.

“Very good,” said Mr. Simpson; “I agree.  Who is there?”

“Me and my wife and Mrs. Simpson,” said Mr. Cooper.

“He is smacking his lips,” whispered Mrs. Cooper.  “Having a go at the beer, perhaps.”

“Let’s go back fifteen years,” said Mr. Simpson in meditative tones.  “Do you remember that girl with copper-coloured hair that used to live in John Street?”

“No!” said Mr. Cooper, loudly and suddenly.

“Do you remember coming to me one day—­two days after Valentine Day, it was—­white as chalk and shaking like a leaf, and—­”

“No!” roared Mr. Cooper.

“Very well, I must try something else, then,” said Mr. Simpson, philosophically.  “Carry your mind back ten years, Bob Cooper—­”

“Look here!” said Mr. Cooper, turning round with a ghastly smile.  “We’d better get off home, Mary.  I don’t like interfering in other people’s concerns.  Never did.”

“You stay where you are,” said his wife.

“Ten years,” repeated the voice behind the door.  “There was a new barmaid at the Crown, and one night you——­”

“If I listen to any more of this nonsense I shall burst,” remarked Mr. Cooper, plaintively.

“Go on,” prompted Mrs. Cooper, grimly.  “One night——­”

“Never mind,” said Mr. Simpson.  “It doesn’t matter.  But does he identify me?  Because if not I’ve got a lot more things I can try.”

The harassed Mr. Cooper looked around appealingly.

“How do you expect me to recognize you—­” he began, and stopped suddenly.

“Go back to your courting days, then,” said Mr. Simpson, “when Mrs. Cooper wasn’t Mrs. Cooper, but only wanted to be.”

Mrs. Cooper shivered; so did Mr. Cooper.

“And you came round to me for advice,” pursued Mr. Simpson, in reminiscent accents, “because there was another girl you wasn’t sure of, and you didn’t want to lose them both.  Do you remember sitting with the two photographs—­one on each knee—­and trying to make up your mind?”

“Wonderful imagination,” said Mr. Cooper, smiling in a ghastly fashion at his wife.  “Hark at him!”

“I am harking,” said Mrs. Cooper.