Is it okay to reference Poirot in novels?

Sure, it can be okay. As long as it's done in a way that's legal and doesn't violate any copyrights.

Yes, it is. But you need to make sure it fits well and doesn't feel forced. Also, be careful about copyright issues if you're using specific elements from the movie.

Sure, it can be okay. It depends on how it fits into the story and the context. If it adds to the authenticity or plot, go for it.

Definitely 'The Murder of Roger Ackroyd'. Its plot twist is quite famous and has made it a classic among Poirot novels. The way the story unfolds and how Poirot uncovers the truth is really engaging. Also, 'Death on the Nile' is popular. The exotic location of the Nile River and the web of relationships among the characters make it a great read. The murder mystery set against the backdrop of a luxury cruise is full of suspense.

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.

The order of Poirot novels can be a bit complex as Agatha Christie wrote many. Some of the early and well - known ones include 'The Mysterious Affair at Styles'. Generally, they were published over a span of several decades, starting from the 1920s. However, different editions and collections may group them in various ways, but a chronological reading can give you a good sense of the development of Poirot as a character.

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.

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

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.

I think 'Murder on the Orient Express' is a top one. It's so famous. Also, 'The Murder of Roger Ackroyd' is really good.