Envelope containing the document in question

“..... the document in question is of such immense importance that its publication might very easily — I might almost say probably — lead to European complications of the utmost moment. It is not too much to say that peace or war may hang upon the issue.” (Lord Bellinger)
“Mr. Holmes, the envelope is a long, thin one of pale blue colour. There is a seal of red wax stamped with a crouching lion. It is addressed in large, bold handwriting to —”