poirot and ariadne oliver

That's a tricky one. I don't have an immediate number off the top of my head. It could vary depending on the specific storylines and circumstances in each novel.

Definitely 'Murder on the Orient Express'. It's extremely popular because of its complex plot and the unique way the murder is carried out on a train with a diverse group of suspects.

There are quite a few Poirot stories. It's hard to give an exact number, but Agatha Christie wrote many of them.

To be precise, there are around 33 Poirot novels. Agatha Christie's creation of Poirot has left a lasting impression on the literary world with this collection of intriguing tales.

In most cases, it is okay to reference Poirot in novels. It can bring a familiar element to the story and attract readers who are fans of Poirot. Just be careful to use the reference appropriately and not rely on it too heavily to carry the plot.

There are over 30 Poirot novels. It's quite a significant collection for fans of mystery fiction.

One of the best Poirot novels is 'Murder on the Orient Express'. It has a complex and captivating plot where Poirot has to solve a murder that occurs on a train filled with a diverse group of suspects. Another great one is 'Death on the Nile'. The setting on a Nile steamer adds an exotic touch to the mystery. 'The ABC Murders' is also excellent. It shows Poirot's brilliant mind as he tries to figure out the pattern behind a series of murders.

There are quite a few Hercule Poirot novels. The exact number depends on how you count and which editions you consider, but it's around 33.

Some of the best Hercule Poirot novels include 'Murder on the Orient Express' and 'Death on the Nile'. These are highly regarded for their intricate plots and Poirot's brilliant deductions.

The first Hercule Poirot novel is 'The Mysterious Affair at Styles'.