Ellery Queen’s Mystery Magazine. Vol. 4, No. 1. Whole No. 8, January 1943

The enclosure ran as follows:

I, Arthur Tressider of (here followed his address in Essex) hereby confess that I murdered my ward and nephew, Cyril Tressider, in the following manner. Knowing that the child was in the habit of playing in the garden of Crantonbury Hall, adjoining my own residence, and vacant for the last twelve months, I searched this garden carefully and discovered there a number of old potato-plants, some of them bearing potato-apples. Into these potato-apples I injected with a small syringe a powerful solution of the poisonous alkali solanine, of which a certain quantity is always present in these plants. I prepared this solution from plants of solanum which I had already secretly gathered. I had no difficulty in doing this, having paid some attention as a young man to the study of chemistry. I felt sure that the child would be tempted to eat these berries, but had he failed to do so I had various other schemes of a similar nature in reserve, on which I should have fallen back if necessary. I committed this abominable crime in order to secure the Tressider estates, entailed upon me as next heir. I now make this confession, being troubled in my conscience.