Dear Mr. Parrish,
Your favour of even date to hand and contents noted. The last delivery of steel was to time but we have had warning from the railway authorities that labour troubles at the docks are likely to delay future consignments. If you don’t mind we should prefer to settle the question of future delivery by Nov. 27 as we have a board meeting on the 30th inst. While we fully appreciate your own difficulties with labour at home, you will understand that this is a question which we cannot afford to adjourn sine die.
Yours faithfully,
pro ELIAS VAN DER SPYCK & CO.
“‘The last ... warning,’” Robin read out, “‘if you don’t ... settle ... by Nov. 27 ... you ... die ...!’”
He looked up. “Last Saturday,” he said, “was the 27th, the day that Parrish died ...”
“The grill,” remarked the big man authoritatively, “is one of the oldest dodges known to the Secret Service. It renders a conventional code absolutely undecipherable as long as it is skilfully worded, as it is in this case. You send your conventional code by one route, your key by another. I make no doubt that this was the way in which van der Spyck & Co. transacted their business with Hartley Parrish. They simply posted their conventional code letters through the post in the ordinary way, confident that there was nothing in them to catch the eye of the Censor’s Department. The key might be sent in half a dozen different ways, by hand, concealed in a newspaper, in a parcel ...”
“So this,” said Robin, pointing at the letter, “was what caused Hartley Parrish to make his will. It would lead one to suppose that it was what induced him to commit suicide were not the presumption so strong that he was murdered. But who killed him? Was it Jeekes or Marbran?”
Herr Schulz pitched his cigar-stump into an ash-tray.
“That,” he said, “is the question which I am going to ask you gentlemen to help me answer. You will realize that legally we have not a leg to stand on. We are in a foreign country where, without first getting a warrant from London, we can take no steps whatever to run these fellows in. To get the Dutch police to move against these gentry in the matter of the assault upon Miss Trevert would waste valuable time. And we have to move quickly—before these two lads can get away. I therefore propose that we start this instant for the Villa Bergendal and try, if we are not too late, to force Marbran or Jeekes or both of them to a confession. That done, we can hold them if possible until we can get the Dutch police to apprehend them at the instance of Miss Trevert. Then we can communicate with the English police. It’s all quite illegal, of course! You have a car, I think, Mr. Greve! You will come with us, Dr. Collingwood? Good! Then let us start at once!”
Robin intervened with a proposal that they should call en route at his hotel to see if there were any telegrams for him.