Which of these novels by James Hilton was not made into a major motion picture?

"Murder at School", the clever novel from the 1930's by Jack Finney, was never made into a movie, despite a number of ill-fated attempts by filmmakers over the years to convince studios to adapt it. "Lost Horizon"―1933, "Goodbye, Mr. Chips"―1934 and "Random Harvest"―1941 (all novels written by James Hilton) were adapted into major motion pictures.

"Murder at School", a detective novel by James Hilton, was first published in 1931 under the pen-name Glen Trevor. It was released as a novel in the USA the following year under the title, "Was It Murder?". The novel is a whodunnit where the plot deals with the phenomenon of coincidence by posing the question of how likely it is that two brothers attending the same boarding school meet with two separate accidental deaths. The deaths are curious ones at that, within the same schoolyear.

The films "Lost Horizon", "Goodbye, Mr. Chips", and "Random Harvest" are an adventure drama fantasy by Frank Capra, a romantic drama by Sam Wood, and a romantic drama film by Mervyn LeRoy, respectively.

James Hilton (1900–1954) was a bestselling English novelist and Academy Award–winning screenwriter. After attending Cambridge University, Hilton worked as a journalist until the success of his novels "Lost Horizon" and "Goodbye, Mr. Chips" launched his career as an author. His writing is known for its depiction of English life between the two world wars and its honest portrayal of life in the early 20th century.