"Exactly. We have to find some one who shared the knowledge with him. Let me go back to the missing bag for a moment. Since it was on the Chesterfield, Bridwell must have seen it. What would he do with it? What would you have done with it, Wigan? I think you would have just put it on a side table or in a handy drawer; yet it had gone. The fact of its disappearance stuck in my mind from the first, although I did not at once see the full significance of it. On the cover of the telephone directory there were two or three numbers scribbled in pencil; I made a note of them with the idea that the woman might be traced that way. However, arguing that a man would be likely to know the telephone number of a woman he was in love with, and have no necessity to write it down, I took no trouble in this direction. I went to see Bridwell's solicitor instead. I led him to suppose that I was interested in the study of the Renaissance, and asked him if Bridwell had had a companion during his wanderings in Italy three years ago. For part of the time, at any rate, he had--a partner rather than a companion, a man named Ormrod--Peter Ormrod. I knew the name at once, because Ormrod has written many articles for the reviews, and all of them have been about Italy in the thirteenth and fourteenth centuries. Ormrod's telephone number is 0054 Croydon, and he is married, and I think it was his wife who spoke to you over the telephone. My theory is that Ormrod had discovered that his wife was in love with his friend, and used his knowledge of this poisoning method, which could not be detected, remember, to be revenged. I think he came to the flat that evening after Bridwell's guests had gone, perhaps he expected to find his wife there. I do not think he quarreled with his false friend. I think he showed great friendliness, talked a little of the past perhaps; and then, in examining some book or paper, leant over his friend as he sat at the table, and the deed was done. If the bag was lying on a side table he saw it and took it away; if it was lying in a drawer no doubt he found it while he was looking for letters from his wife to Bridwell, or for her photograph--anything which would connect her name with Bridwell. Somehow, he found it and took it away. There is no one else who would be likely to take it."