Question: Where was the novel that inspired the play Murder on the Nile first published?

Context paragraphs:
Death on the Nile: Death on the Nile is a book of detective fiction by Agatha Christie and first published in the UK by the Collins Crime Club on 1 November 1937 and in the US by Dodd, Mead and Company the following year.  The UK edition retailed at seven shillings and sixpence (7/6) and the US edition at $2.00.  The full length novel was preceded (1937) by a short story with the same title, but with Parker Pyne as the detective.  The details of the short story's plot are substantially different, though the settings and some of the characters are very similar.

Man Overboard! (Freeman Wills Crofts novel): Man Overboard!  (also known as Cold-Blooded Murder) is a detective novel by Freeman Wills Crofts, first published in 1936.  It is the fifteenth novel in the Inspector French series.  The book is set largely in Northern Ireland, and re-uses two of the characters from the earlier novel "Sir John Magill's Last Journey" (1930) which was set in the same country.  As a MacGuffin, the novel centres on a supposedly newly discovered (though possibly fraudulent) reversible chemical process that converts petrol into an inert form which is much safer for transport and storage.  The potential commercial value of this discovery leads to intrigue, theft and murder, with everything finally solved by Inspector French after his usual dogged legwork and some flashes of inspiration.

Murder on the Nile/Hidden Horizon: Murder on the Nile (1944) is a murder mystery play by crime writer Agatha Christie, based on her 1937 novel "Death on the Nile".  The notable John Anderson chose to portray McNaught in this play before retiring from the stage.

Raiders of the Nile: Raiders of the Nile is a novel by American author Steven Saylor, first published by Minotaur Books in 2014.  It is the fourteenth book in his Roma Sub Rosa series of mystery stories set in the final decades of the Roman Republic, but the second chronologically.  The main character is the Roman sleuth Gordianus the Finder.

The Other House: The Other House is a novel by Henry James, first published as a serial in the "Illustrated London News" in 1896 and then as a book later the same year.  Set in England, this book is something of an oddity in the James canon for its plot revolving around a murder.  The novel was originally planned as a play called "The Promise".  James sketched a scenario for the play in 1893, but it didn't interest theater managers.  In 1896 James converted the scenario into "The Other House" for publication in a popular weekly magazine.  He converted the novel back into a play in 1909, but it again failed to be produced.

A Man Lay Dead: A Man Lay Dead is a detective novel by Ngaio Marsh; it is the first novel to feature Roderick Alleyn, and was first published in 1934.  The plot concerns a murder committed during a detective game of murder at a weekend party in a country house.  Although there is a side-plot focused on Russians, ancient weapons, and secret societies, the murder itself concerns a small group of guests at Sir Hubert Handesley's estate.  The guests include Sir Hubert's niece (Angela North), Charles Rankin (a 46- or 47-year-old man about town), Nigel Bathgate (Charles's cousin and a gossip reporter), Rosamund Grant, and Mr and Mrs Arthur Wilde.  Also in attendance are an art expert and a Russian butler.  Unlike later novels, this novel is more focused on Nigel Bathgate and less so on Alleyn.

Died in the Wool: Died in the Wool is a detective novel by Ngaio Marsh; it is the thirteenth novel to feature Roderick Alleyn, and was first published in 1945.  The novel concerns the murder of a New Zealand parliamentarian on a remote sheep farm on the Canterbury Region of the South Island of New Zealand, said to be located in Mackenzie country near Aoraki/Mount Cook (which in the novel is referred to as the "Cloud-Piercer", the highest in a series of several peaks surrounding the high plateau where most of the action occurs).  Like the previous novel in the series ("Colour Scheme") the story takes place during World War II with Alleyn doing counter-espionage work.  The format of the book is somewhat unusual, in that Alleyn does not arrive at the scene of the murder until fifteen months after it has taken place, and much of his detecting is founded upon stories told him by the chief witnesses in the case.

Chiefs (novel): Chiefs is the first novel in the "Will Lee series" by Stuart Woods.  It was first published in 1981 by W. W. Norton & Company.  The novel takes place in the fictional town of Delano, Georgia, over three generations, as three different police chiefs attempt to identify a serial killer operating in the area.  It is Woods' first published novel.  As the author explains in a note, it was inspired by the story of his grandfather's death while serving as a police chief.  "Chiefs" was made available in e-book format on January 23, 2012.

Light Thickens: Light Thickens is a detective novel by Ngaio Marsh; it is the thirty-second, and final, novel to feature Roderick Alleyn, and was first published in 1982.  The plot concerns the murder of the lead actor in a production of "Macbeth" in London, and the novel takes its title from a line in the play.  A number of characters in the book appeared previously in Marsh's novel "Death at the Dolphin".  The novel is dedicated to the actors James Laurenson and Helen Thomas who had played Macbeth and Lady Macbeth respectively in the author's 1962 production of the play, which she had previously directed, also for The Canterbury University Players, in 1946.

The Angel of the Revolution: The Angel of the Revolution: A Tale of the Coming Terror (1893) is a science fiction novel by the English writer George Griffith.  It was his first published novel and remains his most famous work.  It was first published in "Pearson's Weekly" and was prompted by the success of "The Great War of 1892" in "Black and White" magazine, which was itself inspired by "The Battle of Dorking".

Supporting paragraphs: Murder on the Nile/Hidden Horizon Death on the Nile
Answer: UK