Sleuthhound

Sometimes he pursued the wily burn trout with relentless ferocity and the silent intentness of a sleuthhound. Often, however, he would pause and with his finger indicate some favourite stone to Winsome.

Source: wiktionary

And straightway the minions of the law led forth from their donjon keep one whom the sleuthhounds of justice had apprehended in consequence of information received.

Source: wiktionary

Of course, that may be an accident and couldn't possibly be called a case against anybody; but then we haven't the means to make a real case against anybody. Till the police come we are only a pack of very amateur sleuthhounds.

Source: wiktionary