"Cambric Tea" by Marjorie Bowen
A young physician, Bevis Holroyd is called down from London to the bedside of a new patient on Christmas Eve. The man makes the astounding accusation that his wife is poisoning him, lacing his cambric tea with arsenic. Cambric tea as described in the story sounds disgusting by the way, a drink made up of half milk and half warm water. Anyway, the doctor is familiar with this type of case, having just solved assisted in solving a murder mystery involving the same style of poisoning.
It's not quite as clear cut a case as it seems at first, however. We slowly learn that the wife and the doctor knew each other previously, had actually been in love at one time.
This short tale is full of treachery, jealously, distrust, all the essentials of a good mystery boiled down into just a few pages. It had me engrossed, wondering who was telling the truth, what was actually going...