Peril at End House, by Agatha Christie

In Peril at End House, Hercule Poirot and his friend Captain Hastings try to prevent the murder of a young woman, Nick Buckley, who has recently experienced three close calls that were interpreted as accidents. When they meet her, she waves off what she thinks is a wasp, but Poirot determines that it was a bullet that went through the brim of her cap. To protect Nick, they inspect the sites of previous accidents and caution her to be careful, but in a case of mistaken identity, Nick's cousin Maggie is murdered in her stead. Poirot hides Nick away in a nursing home for her own protection, but even there she nearly dies from poisoning. Eventually, Poirot divines what's really going on at End House, but what I found interesting about this novel is that he is tripped up over and over again and truly doubts his own abilities, something that I haven't seen in the earlier books. This one also included several antisemitic comments that really stand out today.  I  enjoyed this book, although I missed the supremely confident Poirot I'd become used to, and I would say that it's not one of Christie's better books.