That was safe in the custody of Sheridan, who had taken it to America and kept it in hiding from both parties.

It was the special object of my mission.
The English detective who had preceded me had the navet to apply to the chief of the New York detective police, an Irishman, for assistance, and was handed over to pretended colleagues who were really agents of the Irish organization, and so completely duped by them as to be induced to send a supposed detective (who was one of themselves) to Mexico, where he was assured that Sheridan had gone, and led to undertake various operations which were simply contrivances to make him lose his time and his money.
On carefully surveying the ground at New York before attempting to make any direct application to any person whom I supposed capable of furnishing me with what I sought, I discovered that the detective service of New York was in the hands of the Fenian organization, that the chief of police (now deceased) was their confederate, and, above all persons, not to be taken into my confidence, and that the principal line of transatlantic telegraph was under the supervision of a confederate of the association.

The latter betrayed himself at once by the absurd difficulties he made about my registering a London telegraphic address, which I at the instant saw to be assumed for the purpose of delay and imposing on me a prearranged address, which, however, I accepted with apparent simplicity and good faith.

My telegrams were of course to be in cipher, and this was so secure from all attempts at deciphering that I had no anxiety about the Irish chiefs solving it.

I have heard in later times that they boasted of having copies of all my messages (which is probable) and having read them, but this was impossible, as not only was the cipher extremely difficult to any one even who had the key, but the key was changed every day by a scheme arranged before I left London and known only by the office and myself.