Poirot also sniffs some perfume which is the same perfume that Arlena uses. Miss Darnley mentions there is a cave and takes Japp, Poirot and Hastings there. Captain Marshall doesn't have a proper alibi in this case because no one saw him typing.

Although this sounded threatening, Poirot surmised that being American, Nathan's 'great deal' meant a great business deal. There is also a telegram telling her to send money or else she would lose a great deal.

There is an additional side plot featuring a stock broker Nathan Lloyd who is heard asking Arlena for money.

In this adaptation, Lionel's spare spectacles is planted instead.

In the book, a pipe stolen from Captain Marshall is placed near the bottom of the ladder in an attempt to incriminate him.

Redfern and Brewster discover the body of Arlena just like in the original.

Patrick Redfern takes out a boat and invites Emily Brewster (he earlier invited Poirot who turned him down).

Hastings replaces Mr Gardiner as the fourth person at the tennis game.

This is like in the original novel except that in this case the bottle lands on the grass near the stairs and not in the sea. She does apply the fake tan and throws out the bottle containing it before she leaves to join Lionel and it almost hits Miss Brewster.

Christine does not make a claim that she has a fear of heights this detail is omitted.

Lionel does not do anything in the episode directed at harming Arlena. The witchcraft subplot featuring Linda in the original is not used. He is found to be reading a book about dangerous chemicals and poisons, but he doesn't attempt suicide in the course of the investigation.

Linda Marshall is changed to a son called Lionel.

Poirot is mainly there to recover from ill health, after collapsing during the opening night of Hasting's new restaurant when the case is completed, it is revealed his collapse was from food poisoning caused by the poor standards of hygiene at the restaurant.

The hotel is a health retreat known as the Sandy Cove Hotel.

Hastings provides assistance in the case Japp is the investigating officer Miss Lemon makes inquires into Alice Corrigan's murder at Poirot's request.

The characters of Captain Hastings, Inspector Japp and Miss Lemon are included into the story.

The characters of Carrie and Odell Gardener, Inspector Colgate and Dr Neasdon are omitted.

Spoiler warning: A spoiler is announced! The following section contains details about Evil Under the Sun (Agatha Christie's Poirot episode).

Evil under the sun hercule poirot