anish territorial waters
off the Cabo de Cabron. A green light will be shown in three
short flashes from the sea and it should be answered from
the shore by a red and a white and two reds._"

Hillyard leaned back in his chair.

"B45," he cried in exasperation. "We get no nearer to him."

"Wait a bit!" Fairbairn interposed. "We are a deal nearer to him through
Zimmermann's very letter here. What are these tubes which have been so
successful in France? Once we get hold of them and understand them and
know what end they are to serve, we may get an idea of the kind of man
obviously suitable for handling them."

"Like B45," said Hillyard.

"Yes! The search will be narrowed to one kind of man. Oh, we shall be
much nearer, if only we get the tubes--if only the Germans in Madrid
don't guess this letter's gone astray to us."

Hillyard had reflected already upon that contingency.

"But why should they? The sleeping-car man is held _incomunicado_. There
is no reason why they should know anything about this letter at all, if
we lay our plans carefully."

He folded up the letter and locked it away in the drawer. He looked for
a while out of the window of the saloon. The yacht had rounded the Cabo
San Antonio. It was still the forenoon.

"This is where Jose Medina has got to come in," he declared. "You must
go to Madrid, Fairbairn, and keep an eye on Mr. Jack Williams.
Meanwhile, here Jose Medina has got to come in."

Fairbairn reluctantly agreed. He would much rather have stayed upon the
coast and shared in the adventure, but it was obviously necessary that a
keen watch should be kept in Madrid.

"Very well," he said, "unless, of course, you would like to go to Madrid
yourself."

Hillyard laughed.

"I think not, old man."

He mounted the ladder to the bridge and gave the instructions to the
Captain, and early that evening the _Dragonfly_ was piloted into the
harbour of Alicante. Hillyard and Fairbairn went ashore. They had some
hours to get through before they could take the journey they intended.
They sauntered accordingly along the esplanade beneath the palm trees
until they came to the Casino. Both were temporary members of that club,
and they sat down upon the cane chairs on the broad side-walk. A
military band was playing on the esplanade a little to their right, and
in front of them a throng of visitors and townspeople strolled and sat
in the evening air. Hillyard smiled as he watched the kalei