Your instinct is always to do something energetic.

But supposing, for argument's sake, that we had him arrested to-night, what on earth the better off should we be for that?
We could prove nothing against him.

There's the devilish cunning of it! If he were acting through a human agent we could get some evidence, but if we were to drag this great dog to the light of day it would not help us in putting a rope round the neck of its master." "Surely we have a case." "Not a shadow of one--only surmise and conjecture.

We should be laughed out of court if we came with such a story and such evidence." "There is Sir Charles's death." "Found dead without a mark upon him.

You and I know that he died of sheer fright, and we know also what frightened him; but how are we to get twelve stolid jurymen to know it?
What signs are there of a hound?
Where are the marks of its fangs?
Of course we know that a hound does not bite a dead body and that Sir Charles was dead before ever the brute overtook him.