Originally published in the US in 1932, and then in the UK later in the same year. I listened to an unabridged audio book read by Hugh Fraser. It features Hercule Poirot, Captain Hastings, and, towards the end, Inspector Japp.
It is Poirot's 6th novel, and there's a couple of gentle references in the novel to his previous case THE MYSTERY OF THE BLUE TRAIN published in 1928.

Hastings and Poirot are having a week's holiday at St. Loo in Cornwall. Hastings has recently returned from Argentina, seemingly having left his wife behind. Poirot has retired and turns down a request from the Home Secretary to go up to London to take on a most urgent case. However he reserves the right to take on a new case if it interests him.

As always Poirot is attracted to a pretty young thing, Miss Nick Buckley, who appears to have recently been shot at. When he hears that she has had several near encounters with death just recently Poirot decides to make her protection his business. Nick Buckley is a young flapper living well beyond her means at End House. She is surrounded by a coterie of similar care-free young things who party a lot and experiment with drugs like cocaine. Any one of them could be a danger to Miss Nick, but why would any of them want to kill her?

Despite his own confidence in his own abilities, PERIL AT END HOUSE clearly demonstrates that even the great Hercule Poirot is fallible. Poirot says that Hastings always leaps to the wrong conclusions, and so we have come to expect Hastings to be led astray by sentiment, but not Hercule Poirot who prides himself on his deductive methods and his use of "the little grey cells". Agatha Christie's behind-the-hand smirking at her own pompous creation is almost palpable.

Without doubt, the beautiful narration of Hugh Fraser, who has appeared in a number of the TV episodes as Hastings, contributed to my enjoyment.
But let's take nothing away from the cleverness of the plot, nor from the controversial ending in which, to Hastings' horror, Poirot allows the murderer to cheat the gallows. ( )

The thing about a Hercule Poirot Mystery is that he's always in the picture; quite unlike a Miss Marple Mystery wherein the supposed sleuth only appears at or near the end to provide the summing up.

This was a good one. I'm intrigued by detective writers' Christie and Sayers's use of the resort as a venue for crime. ( )

This early Poirot/Hastings novel is good fun. Our duo are holidaying on the Cornish coast, and meet the adorable Nick, a lovely young thing who's inherited the eponymous Victorian pile. Oh, and someone's trying to kill her. Poirot strives to head off tragedy, but his vigilance is not enough . . . .

Although Christie's early work includes some of her best, in this one she still seems to be finding her way. Poirot's character is a bit jumpy here, and the solution to the plot seemed pretty obvious to me from a ways off.

Still, I'd recommend this one for its lively writing, good period detail, and general Christie-esque charm. ( )

I love this book the plot has so many twists and turns to that you never quite know where you are, as well a few red herrings as well. Oh yes and the denoument makes sense. ( )

2783 Peril at End House, by Agatha Christie (read 15 Sep 1995) This is a good book, with a very surprising ending. I admit I never suspected the killer before Poirot explained. Like in The Murder of Roger Ackroyd (read by me on 21 Feb 1995) and Murder on the Orient Express (read by me 11 Mar 1995), the murderer is one people ordinarily will not suspect. "Nick" is the owner of End House, and tells of three narrow escapes, convincing Poirot someone is trying to kill her. Her friend, Maggie, comes to End House and is killed. There are various contrivances and cross currents. The book must be accounted a success. This edition of this book was published in 1978 (Christie died in 1976) and says she wrote 76 detective novels and books of stories, six romantic novels under the pseudonym Mary Westmacott, several plays, and a book of poems ( )