When their friend, inspector Japp came over, he identified the person as a secret service agent, who had reportedly gone missing a few months ago. They initially thought that he just another tramp, and hurried to call a doctor, but then they saw that he held in his hand a piece of paper, in which the number four was scribbled all over again. A man was standing, framed in the doorway, swaying from side to side, covered from head to foot in dust. Hercule Poirot and his friend Captain Hastings were sitting in their rooms when an uninvited, and certainly unexpected guest arrived. This is the time when Hercule Poirot tackled criminals who were more than mere murderers, and whose very existence posed a threat to humanity. But in this one, its Big, its Bad, and its Bold. Most of his stories revolve around the murders of normal people. This novel is an attempt by Agatha Christie to – for once – elevate Hercule to the level of an international agent. So, without further ado, let’s get started. Also, please check out my other posts if you haven’t already. These are the books number five, and six. I hope you like the previous reviews I had posted on the same series. Today, I am back with another couple of Hercule Poirot reviews: The Big Four, and The Mystery of the Blue train.

Only Rufus Van Aldin is there to hear Poirot's evidence that Knighton is the culprit while the episode's ending features all the suspects reunited on the Train Bleu here, Poirot exposes Ada Mason first, then accuses Knighton as Ada's accomplice.Hello everyone! Welcome, or welcome back to my blog.

In the novel, Major Knighton is exposed as the murderer.

This gives Mirelle a further motive for killing Ruth Kettering.

Her character is kept loosely here she is a dancer at Parthenon (as in the original novel) but she is Rufus Van Aldin's lover. In the episode, Mirelle is renamed Mirelle Milesi.

In the original novel, Mirelle is Derek Kettering's lover.

While this happened, Derek Kettering was in prison this makes Poirot know that Derek wasn't the culprit of Ruth's murder. However, Ada Mason is jealous so she tries to kill Katherine.

Just like in the original novel, Richard Knighton falls in love with Katherine Grey.

Spoiler warning: A spoiler is announced! The following section contains details about The Mystery of the Blue Train novel and its adaptation.

Oliver Milburn as Armand de la Rochefour.

Who is the culprit? Poirot interviews the girl's father, her maid, her estranged husband, her eccentric cousins, and a raft of other strange passengers, as he pieces together the tragic story. While travelling on the Blue Train between Calais and Nice, Poirot gets mixed up in the investigation of the brutal murder of American heiress Ruth Kettering, and the disappearance of her fabulous ruby, the ' Heart of Fire'.

Hercule poirot the blue train