Philip Marlow Sidney, A history of the gunpowder plot… (1904)
“ It seems extraordinary that astute men like these hunted Jesuits, who had for many years had to defend themselves against innumerable tricks and strategems laid for them by their enemies, should have fallen into so simple a trap. But they did, and relying on their janitor's word and fidelity, opened up a series of conversations by removing the stone in the wall, utterly unsuspecting that this same hollow wall concealed the persons of two agents of the Privy Council, who wrote down every word they heard of these conversations. ”
