The plot involves a series of murders committed in a country house, located in France, that has been converted into a hotel.
The protagonists are Ethelred, a not very successful author of crime fiction (and slushy romance under another pen-name) and Elsie, his literary agent.
Elsie is a strong willed no-nonsense character who is given to plain speaking when it comes to pointing out Ethelred's shortcomings.
The cut and thrust between the two is what makes the series.
Ethelred is not as simple as Elsie would have us believe although, as Elsie enjoys pointing out, he is extremely gullible were women are concerned.
As the story is unfolding, it is quite funny to see how each has a very different take on what is happening around them.
The exchanges between the two are a joy to read.
The ending is a spoof on the usual Agatha Christie endings when the very able detective shows off his deductive skills by uncovering the murderer through the application of faultless logic. He/she usually gathers all suspects in the one room and takes them through his/her reasoning and unmasks the killer.
In this particular case however, Elsie attempts to emulate Agatha Christie's sleuths but with a fundamental difference; everybody in the room (including two very young adults) have already worked out what has occurred whereas Elsie has got it all wrong.
We find that Elsie has been following, and has been taken in, by most if not all of the red herrings that have been put her way.
I would read this series in sequence, you will benefit. The first is The Herring Seller's Apprentice.