press would be furious if it did. The papers which this wretched
youth had in his pocket were the plans of the Bruce-Partington
submarine."

Mycroft Holmes spoke with a solemnity which showed his sense of
the importance of the subject. His brother and I sat expectant.

"Surely you have heard of it? I thought everyone had heard of
it."

"Only as a name."

"Its importance can hardly be exaggerated. It has been the most
jealously guarded of all government secrets. You may take it
from me that naval warfare becomes impossible withing the radius
of a Bruce-Partington's operation. Two years ago a very large
sum was smuggled through the Estimates and was expended in
acquiring a monopoly of the invention. Every effort has been
made to keep the secret. The plans, which are exceedingly
intricate, comprising some thirty separate patents, each
essential to the working of the whole, are kept in an elaborate
safe in a confidential office adjoining the arsenal, with
burglar-proof doors and windows. Under no conceivable
circumstances were the plans to be taken from the office. If the
chief constructor of the Navy desired to consult them, even he
was forced to go to the Woolwich office for the purpose. And yet
here we find them in the pocket of a dead junior clerk in the
heart of London. From an official point of view it's simply
awful."