David Renwick wrote the 'The Tragedy at Marsdon Manor' and adds his brand of humour rather well. Such as Poirot and Hastings arrive at a hotel hastily to meet a man who has an important case to solve. It turns out to be the hotel owner who has written a mystery book and has got writer's block regarding the denouement.
Pretty soon after stumbling on to his own waxwork model, Poirot comes across the death of the wealthy owner of Marsdon Manor, Jonathan Travers. He was recovering from an operation on his ulcer which seems to be the cause of his death.
Poirot suspects foul play, his younger wife, Susan believes supernatural elements are at work. That her husband died of fright. There is a mysterious traveller from Africa who checked in at the same hotel as Poirot who has swiftly disappeared.
This is a nifty mystery, well balanced with humour and Poirot always one step ahead. The reveal is a little difficult to buy but works well in context as you always suspect the culprit was someone closely tied to the victim.