My adventure was well known.

The newspapers had given it in full detail.

Some satirist, such as exists even in America, must have written this threatening letter to mock me.
To assume, on the other hand, that the Eyrie really served as the refuge of a band of criminals, seemed absurd.

If they feared that the police would discover their retreat, surely they would not have been so foolish as thus to force attention upon themselves.

Their chief security would lie in keeping their presence there unknown.