“A most annoying business, Sherlock,” said he. “I extremely dislike altering my habits, but the powers that be would take no denial. In the present state of Siam it is most awkward that I should be away from the office. But it is a real crisis. I have never seen the Prime Minister so upset. As to the Admiralty⁠—it is buzzing like an overturned beehive. Have you read up the case?”

“We have just done so. What were the technical papers?”

“Ah, there’s the point! Fortunately, it has not come out. The 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.”