About the book: 1908 / The incredible happened - Mycroft Holmes, Sherlock's brother, personally came to his home. Clearly this is going to be an extraordinary case, affecting state interests. And indeed, the corpse of a young clerk was discovered on the London Underground tracks with secret drawings of the newest submarine in his pocket. But the worst thing is not this, but the fact that the most important of these drawings disappeared without a trace. Will Sherlock Holmes be able to unravel this mysterious case??