“And when did you come to this decision, may I ask?”

“After our little experiment in the garden this morning,” was the detective’s prompt reply.

Robin looked at him fixedly.

“But, see here,” he said, “apparently it was to the deductions you formed from the result of that experiment that I owe the attentions of your colleagues who have been hanging round the house all day. And yet you now come to me and invite my assistance. Mr. Manderton, I don’t get it at all!”

“Mr. Greve,” replied the detective, “Miss Trevert tried to shield you. That made me suspicious. You tried to force my investigations into an entirely new path. That deepened my suspicions. I believed it to be my duty to ascertain your movements after leaving Harkings. But then I heard Jeekes make an apparently gratuitously false statement to Miss Trevert with an implication against you. That, to some extent, cleared you in my eyes. I say ‘to some extent’ because I will not deny that I thought I might be taking a risk in coming to you like this. You see I am frank!...”

The smile had left Greve’s face and he looked rather grim.

“You’re pretty deep, aren’t you?” was his brief comment.

CHAPTER XX.
THE CODE KING

Major Euan MacTavish was packing. A heavy and well-worn leather portmanteau, much adorned with foreign luggage labels, stood in the centre of the floor. From a litter of objects piled up on a side table the Major was transferring to it various brown-paper packages which he checked by a list in his hand.

The Major always packed for himself. He packed with the neatness and rapidity derived from long experience of travel. As a matter of fact, he could not afford a manservant any more than he could allow himself quarters more luxurious than the rather grimy bedroom in Bury Street which housed him during his transient appearances in town. The remuneration doled out by the Foreign Office to the quiet and unobtrusive gentlemen known as King’s messengers is, in point of fact, out of all proportion to the prestige and glamour surrounding the silver greyhound badge, an example of which was tucked away in a pocket of the Major’s blue serge jacket hanging over the back of a chair.