“I know what that means,” said Mike. “But you needn’t worry. Chief Detective-Inspector Alleyn’ll solve the mystery sometime to-day, I should think. Robin, did you know Chief Detective-Inspector Alleyn happened to have rather an important talk with me last night?”

“Did he, Mikey? That was fun, wasn’t it?”

“Not bad. He happened to want to know one or two things and I happened to remember them. I must say he’s an absolute whizzer. Well,” added Mike, “I mean he’s the kind of person another person knows bang off for a whizzer. You can kind of recognize it. I say, Robin, do you know he hadn’t got his magernifying-glass with him and I happened to be able to lend him mine? I bet he finds some pretty hot clues with my magernifying-glass. Hoo!” said Mike, kicking the leg of his chair, “I bet old B-K’s chops fall when I tell him about the magernifying-glass. ”

“Who’s old B-K?”

“A person,” said Mike. “As a matter of fac’ it’s Benham-Kaye in my form at school. He’s pretty high-hat. I bet he won’t be so high-hat when I tell him—”

“Your conversation,” said Frid, “is like a round of catch sung by one person only.”

“What did you tell Mr. Alleyn, Mike?” asked Henry.

“Oh, about when the skewer was in the hall and when it wasn’t and who I saw and when. He said I was a pretty good witness.”

“Robin,” said Henry, “it’s half-past five. I think we should return to duty.”

II