“I don’t think it’s necessary. But it would help us very much if you can recollect to whom you paid it.”

“Oh, I see. Well, that’s rather difficult. I paid my dressmaker’s about that time—no, that was by cheque. I paid cash to the garage, I know, and I think there was a £5 note in that. Then I dined at Verry’s with a woman friend—that took the second £5 note, I remember, but there was a third. I drew out £25—three fives and ten ones. Where did the third note go? Oh, of course, how stupid of me! I put it on a horse.”

“Through a Commission Agent?”

“No. I had nothing much to do one day, so I went down to Newmarket. I put the £5 on some creature called Brighteye or Attaboy or some name like that, at 50 to 1. Of course the wretched animal didn’t win, they never do. A man in the train gave me the tip and wrote the name down for me. I handed it to the nearest bookie I saw—a funny little grey-haired man with a hoarse voice—and that was the last I saw of it.”

“Could you remember which day it was?”

“I think it was Saturday. Yes, I’m sure it was.”

“Thank you very much, Mrs. Forrest. It will be a great help if we can trace those notes. One of them has turned up since in—other circumstances.”

“May I know what the circumstances are, or is it an official secret?”

Parker hesitated. He rather wished now, that he had demanded point-blank at the start how Mrs. Forrest’s £5 note had come to be found on the dead body of the waitress at Epping. Taken by surprise, the woman might have got flustered. Now, he had let her entrench herself securely behind this horse story. Impossible to follow up the history of a bank-note handed to an unknown bookie at a race-meeting. Before he could speak, Wimsey broke in for the first time, in a high, petulant voice which quite took his friend aback.

“You’re not getting anywhere with all this,” he complained. “I don’t care a continental curse about the beastly note, and I’m sure Sylvia doesn’t.”