He suggested that he should move from the Palace Hotel to the Ritz, which was only just opposite. At first it seemed a good idea, but on reflection I did not agree, because I feared lest he might be recognized by Suzor. De Gex, of course, would not know him, but with Suzor the danger of recognition was always great. If either realized that they were being watched, all chances of solving the problem would instantly disappear. Only by secret and patient watchfulness could we discover the motive of that amazing affair near Park Lane, and again the truth of what actually occurred on that fateful November night. "There is no doubt some further devil's game is in progress here," I declared, as Harry sat upon my bed smoking a cigarette, while I was stretched in an easy-chair. "And it is up to us to discover what it is, and whether it has any bearing upon the plot against poor Gabrielle Tennison." "Yes," agreed Hambledon. "We must watch all their actions, for it is now evident that this fellow Suzor is deeply implicated in the conspiracy, whatever its nature." CHAPTER THE FIFTEENTH THE INTRUDER During the next few days I remained idle in the hotel, not daring to go out while it was light, and leaving the surveillance upon De Gex and his friend to my old friend Hambledon. Each night we met at one café or another as we appointed, when he would report to me what he had witnessed during the day. It seemed that De Gex--or Monsieur Thibon, as he preferred to call himself--shared Suzor's private sitting-room and, curiously enough, he also did not go out in the daytime! After all, that was not surprising, for such a great figure in international finance was probably well-known in the Spanish capital. I had learnt that he had had a hand in the finances of Spain, and had made some huge profits thereby. This man of mystery and intrigue was, I felt, there in Madrid with some malice aforethought. The very fact that he feared to be recognized was in itself sufficient proof! On the other hand, Suzor now went out in the daytime, going hither and thither as though transacting business for his friend. Hambledon had reported to me how he had sent three cipher telegrams by wireless from the Correo Central in the Calle Carretas, the first was to London, the second on the following noon to an address in Paris, and the third at one o'clock in the morning to Moroni in Florence. The message to the latter was in figures, groups of five numerals as used by the British Admiralty. Besides, he had also posted several letters in that big box at the chief post-office marked "Extranjero."