I read this Agatha Raisin short story (sub 40 pages) as part of a volume featuring the full-length "Agatha Raisin and the Blood of an Englishman". It's the first of several Christmas-themed stories by well-known writers that I intend reading this December.
Apart from its length, this story also departs from the Agatha Raisin oeuvre in that it is not in fact a "whodunit" detective story, but a simple narrative, albeit featuring a suspicious death!
Encouraged by her friend Mrs. Bloxby, Agatha decides to embrace the Christmas spirit of goodwill, rather than heading abroad as she usually would. She invites several local elderly people, who would otherwise be alone for Christmas, to her home for a slap-up lunch and lavish gifts. Predictably for Carsley, these are not lovely fluffy harmless oldies, but a challenging group of misfits, including an irascible spinster and an unrepentant octogenarian letch.
While employing caterers for the majority of the lunch, Agatha courageously attempts to make a Christmas pudding from scratch, under the scrutiny of her former employee / friend Roy Silver. As expected, the results are hilariously disastrous, but fortunately the pudding becomes the instrument of death for one of Agatha's guests before anyone has to eat it. The remainder of the story follows Agatha's attempts to extricate herself from suspicion, while her surviving guests reap the consequences of Agatha's act of Christmas kindness.
This was a humorous and light-hearted Christmas tale, with Agatha at her self-centred and disaster-prone best.