Is every enemy alien known, I ask? Let us examine a case in point, one in which I have made personal investigation, and to the truth of which a dozen officers of His Majesty's service, and also civilians, are ready to testify. Investigations recently made in certain German quarters in London, notably in the obscure foreign restaurants in the neighbourhood of Tottenham Court Road, where men--many of them recently released from internment-camps--and women meet nightly and toast to the Day of Britain's destruction, revealed to me a startling fact. Here, posing as an Italian and a neutral, I learnt facts regarding the movements of German aircraft long before they were known either to our own authorities or to the Press. For several weeks this fact, I confess, caused me considerable thought. Some secret means of communication must, I realised, exist between the enemy's camp and London, perhaps by wireless, perhaps by the new German-laid cable, the shore-end of which is at Bacton, in Norfolk, and which, eighteen months ago, in company with the German telegraph-engineers, I assisted to test as it was laid across the North Sea to Nordeney. In the archives of the Intelligence Department of the War Office will be found my report, together with a copy of the first message transmitted by the new cable from Norfolk to Germany, a telegram from one of the Kaiser's sons who happened to be in Scotland at the time, and addressed to the Emperor, which read: "Hurrah for a strong navy!"--significant indeed in the light of recent events! I was wondering if, by any secret means, this cable could be in operation when, on the afternoon of February 23rd, an officer of the Naval Armoured Car Squadron called upon me and invited me to assist in hunting spies in Surrey. The suggestion sounded exciting. Signals had been seen for a month or so past, flashed from a certain house high upon the Surrey hills. Would I assist in locating them, and prosecuting a full inquiry? Within half an hour I was in a car speeding towards the point where mystery brooded, and which we did not reach till after dark. A gentleman living three miles across the valley, whose house commanded full view of the house under suspicion--a large one with extensive grounds--at once placed a room at our disposal, wherein we sat and watched. In the whole of these investigations I was assisted by an officer who was an expert in signalling and wireless, a signaller of the service, two other officers equally expert in reading the Morse code, while I myself have qualified both in Morse and wireless, and hold the Postmaster-General's licence.