
A doctor conferring with Scotland Yard had read The Pale Horse and realised that the mysterious "Bovingdon bug" was actually thallium poisoning. In another instance, in 1971, a serial killer, Graham Frederick Young, who had poisoned several people, three fatally, was caught thanks to this book.

It becomes clear to the police that a number of the names on that list are now deceased, but that they all died seemingly of natural courses. A Catholic priest is murdered and on his person is a list of names given to him by a dying lady. Every so often, we hear a very convincing story of appearances of spirits/ghosts and their supernatural powers. First published in 1961, The Pale Horse is a story taking place in the misty arena of supernatural forces. In 1975, Christie received a letter from a woman in Latin America who had thus saved a woman from slow poisoning by her husband and in 1977, a nurse who had been reading The Pale Horse correctly suggested that a baby in her care was suffering from thallium poisoning. ‘The Pale Horse’ reads like Christie trying to do Dennis Wheatley and embrace supernatural horror. The Pale Horse by Agatha Christie Book Review. This novel is notable among Christie's books as it is credited with having saved at least two lives after readers recognised the symptoms of thallium poisoning from the description in the book. It was published in the 1960s when she was an accomplished, mature author. The other reintroduced Christie's earlier thoughts about "Voodoo etc., White Cocks, Arsenic? Childish stuff - work on the mind and what can the law do to you? Love Potions and Death Potions, - the aphrodisiac and the cup of poison. The Pale Horse is a very entertaining mystery novel of Agatha Christie. One, a book "would start somehow with a list of names. The Pale Horse combined two ideas that Agatha Christie had been considering.
