he man's arm. "Come upstairs with me and tell
me all about it. What number was her taxi?"

"County Council LD 6132, police 28,293. Mr. Green has got the name of
the driver from the Public Carriage Department, and I was just going out
to see if I could get hold of him."

"Right; you get along, then. And don't forget that if you miss people
like that again, accident or no accident, there'll be trouble."

Green was waiting for his chief. A question elicited the steps he had
taken to get hold of the driver of the cab, from whom some account of
Lady Eileen's movements might be expected. An all-station message had
been flashed out, asking that the cab, wherever it was sighted, should
be sent, unless still carrying a passenger, to Scotland Yard. There was
little chance of the driver neglecting to obey the summons.

"It's unlucky that our man failed to keep her in sight," said Foyle.
"I'll bet a hundred to one that she's arranged to meet Grell somewhere.
However, there's nothing to do now but to wait. Just look here, Green.
Here is something I picked out of the lady's fire. Help me and we'll see
if we can reconstruct the entire message."

He laid his pocket-book containing the string of disconnected words on
the desk as he spoke. The two bent over them.

CHAPTER XLIII

There is no person in London easier to find than a cab-driver whose
number is known, for the supervision of the Public Carriage Department
is exhaustive. Yet, even so, it was some hours before the man Foyle
sought was reported as being on his way to Scotland Yard.

He came at last, wonder and a little alarm in his face as he was brought
into the room where the superintendent and Green sat. There are many
rules the infringement of which will imperil a licence, and he was not
quite sure that he might not have broken one.

Foyle motioned for the door to be shut. "So you're the cab-driver we're
looking for, are you?" he said. "You're William White?"

"Yes, sir," answered the man. "That's my name."

"All right, White. There's nothing to be alarmed about. You picked up a
lady outside the Metropolitan and Provincial Bank this morning. Just sit
down and tell us where you took her."

"Oh, that is it?" said White, relieved to find that it was merely an
inquiry and not an offence that he was called upon to answer for. "Yes,
sir. I did pick up a lady there. I took her along to the General Post
Office, and waited while she went in. Then----"

"Wait a mi