ll remain and guard the household gods for a
minute, I will go and pay my rent and get a cab."

Half an hour later his few but priceless possessions were loaded on a
four-wheeler and Arnold had bidden farewell for ever to the dingy
room in which he had passed so many hours of toil and dreaming,
suffering and disappointment. Before lunch time they were safely
bestowed in a couple of rooms which Colston had engaged for him in
the same building in which his own rooms were.

In the afternoon, among other purchases, a more convenient case was
bought for the model, and in this it was packed with the plans and
papers which explained its construction, ready for the evening
journey.

The two friends dined together at six in Colston's rooms, and at
seven sharp his servant announced that the cab was at the door.
Within ten minutes they were bowling along the Embankment towards
Westminster Bridge in a luxuriously appointed hansom of the newest
type, with the precious case lying across their knees.

"This is a comfortable cab," said Arnold, when they had gone a
hundred yards or so. "By the way, how does the man know where to go?
I didn't hear you give him any directions."

"None were necessary," was the reply. "This cab, like a good many
others in London, belongs to the Brotherhood, and the man who is
driving is one of the Outer Circle. Our Jehus are the most useful
spies that we have. Many is the secret of the enemy that we have
learnt from, and many is the secret police agent who has been driven
to his rendezvous by a Terrorist who has heard every word that has
been spoken on the journey."

"How on earth is that managed?"

"Every one of the cabs is fitted with a telephonic arrangement
communicating with the roof. The driver has only to button the wire
of the transmitter up inside his coat so that the transmitter itself
lies near to his ear, and he can hear even a whisper inside the cab.

"The man who is driving us, for instance, has a sort of retainer from
the Russian Embassy to be on hand at certain hours on certain nights
in the week. Our cabs are all better horsed, better appointed, and
better driven than any others in London, and, consequently, they are
favourites, especially among the young attaches, and are nearly
always employed by them on their secret missions or love affairs,
which, by the way, are very often the same thing. Our own Jehu has a
job on to-night, from which we expect some results that will mystify