“And the very first thing I hear is that there is a very attractive young governess in the house. So clear, isn’t it? Mr. Symmington, a rather dry repressed unemotional man, tied to a querulous and neurotic wife and then suddenly this radiant young creature comes along.

“I’m afraid, you know, that gentlemen, when they fall in love at a certain age, get the disease very badly. It’s quite a madness. And Mr. Symmington, as far as I can make out, was never actually a good man—he wasn’t very kind or very affectionate or very sympathetic—his qualities were all negative—so he hadn’t really the strength to fight his madness. And in a place like this, only his wife’s death would solve his problem. He wanted to marry the girl, you see. She’s very respectable and so is he. And besides, he’s devoted to his children and didn’t want to give them up. He wanted everything, his home, his children, his respectability and Elsie. And the price he would have to pay for that was murder.

“He chose, I do think, a very clever way. He knew so well from his experience of criminal cases how soon suspicion falls on the husband if a wife dies unexpectedly—and the possibility of exhumation in the case of poison. So he created a death which seemed only incidental to something else. He created a non-existent anonymous letter writer. And the clever thing was that the police were certain to suspect a woman—and they were quite right in a way. All the letters were a woman’s letters; he cribbed them very cleverly from the letters in the case last year and from a case Dr Griffith told him about. I don’t mean that he was so crude as to reproduce any letter verbatim, but he took phrases and expressions from them and mixed them up, and the net result was that the letters definitely represented a woman’s mind—a half-crazed repressed personality.

“He knew all the tricks that the police use, handwriting, typewriting tests, etc. He’s been preparing his crime for some time. He typed all the envelopes before he gave away the typewriter to the Women’s Institute, and he cut the pages from the book at Little Furze probably quite a long time ago when he was waiting in the drawing room one day. People don’t open books of sermons much!

“And finally, having got his false Poison Pen well established, he staged the real thing. A fine afternoon when the governess and the boys and his stepdaughter would be out, and the servants having their regular day out. He couldn’t foresee that the little maid Agnes would quarrel with her boy and come back to the house.”

Joanna asked:

“But what did she see? Do you know that?”