Its history is thoroughly established." "Is it?
Who made it?
Whose crest does it bear?
What does this motto signify?
If you wanted to kill a man would you use this toy?
Why was not the sword itself employed ?" "That string of questions leaves me out, Mr.Brett." "I am equally uninformed.

I can only answer the last one.

The sword is intended for suicidal purposes, the Ko-Katana for an enemy.

This is a case of murder, not suicide." The detective wheeled sharply on his heels, thereby upsetting Charles Peace's telescopic ladder.
"You suspect Okasaki!" he cried.
"My dear fellow! Okasaki is, say, five feet nothing.

The murderer is five feet ten inches in height.