They were, accordingly, taken down by slaves in the night-time, when there were no witnesses of the deed; then, in completion of the savage task, the same slaves walled up the door, after which they were themselves separated, and sent away never to be heard of more.

To save accusation, and, in the event of discovery, to leave himself such justification as might be allowed in a distinction between the infliction of a punishment and the commission of a double murder, Gratus preferred sinking his victims where natural death was certain, though slow.

That they might linger along, he selected a convict who had been made blind and tongueless, and sank him in the only connecting cell, there to serve them with food and drink.

Under no circumstances could the poor wretch tell the tale or identify either the prisoners or their doomsman.

So, with a cunning partly due to Messala, the Roman, under color of punishing a brood of assassins, smoothed a path to confiscation of the estate of the Hurs, of which no portion ever reached the imperial coffers.
As the last step in the scheme, Gratus summarily removed the old keeper of the prisons; not because he knew what had been done--for he did not--but because, knowing the underground floors as he did, it would be next to impossible to keep the transaction from him.
Then, with masterly ingenuity, the procurator had new maps drawn for delivery to a new keeper, with the omission, as we have seen, of cell VI.