“It is satisfactory to know that there can be no difference of opinion upon this case, since

Mr.

Lestrade, one of the most experienced members of the official force, and

Mr.

Sherlock Holmes, the well known consulting expert, have each come to the conclusion that the grotesque series of incidents, which have ended in so tragic a fashion, arise from lunacy rather than from deliberate crime. No explanation save mental aberration can cover the facts.