"What was it?"
"Locked up in the desk in the boudoir, they found a will of Mrs. Inglethorp's, dated before her marriage, leaving her fortune to Alfred Inglethorp. It must have been made just at the time they were engaged. It came quite as a surprise to Wells-- and to John Cavendish also. It was written on one of those printed will forms, and witnessed by two of the servants--not Dorcas."
"Did Mr. Inglethorp know of it?"
"He says not."
"One might take that with a grain of salt," I remarked sceptically. "All these wills are very confusing. Tell me, how did those scribbled words on the envelope help you to discover that a will was made yesterday afternoon?"
Poirot smiled.
"Mon ami, have you ever, when writing a letter, been arrested by the fact that you did not know how to spell a certain word?"
"Yes, often. I suppose every one has."
"Exactly. And have you not, in such a case, tried the word once or twice on the edge of the blotting-paper, or a spare scrap of paper, to see if it looked right? Well, that is what Mrs. Inglethorp did. You will notice that the word 'possessed' is spelt first with one's' end subsequently with two--correctly. To make sure, she had further tried it in a sentence, thus: 'I am possessed.' Now, what did that tell me? It told me that Mrs. Inglethorp had been writing the word 'possessed' that afternoon, and, having the fragment of paper found in the grate fresh in my mind, the possibility of a will--(a document almost certain to contain that word)--occurred to me at once. This possibility was confirmed by a further circumstance. In the general confusion, the boudoir had not been swept that morning, and near the desk were several traces of brown mould and earth. The weather had been perfectly fine for some days, and no ordinary boots would have left such a heavy deposit.
"I strolled to the window, and saw at once that the begonia beds had been newly planted. The mould in the beds was exactly similar to that on the floor of the boudoir, and also I learnt from you that they had been planted yesterday afternoon. I was now sure that one, or possibly both of the gardeners-- for there were two sets of footprints in the bed--had entered the boudoir, for if Mrs. Inglethorp had merely wished to speak to them she would in all probability have stood at the window, and they would not have come into the room at all. I was now quite convinced that she had made a fresh will, and had called the two gardeners in to witness her signature. Events proved that I was right in my supposition."