The movie is based on the play. Especially the endings are almost the same.
The movie "And Then There Were None" is based on the book of the same name by Agatha Christie. While both follow a similar premise of guests being mysteriously killed on an island, there are some differences in character development and plot details between the two versions. The book provides more depth and background to the characters, while the movie may have condensed or altered certain aspects for cinematic purposes.
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