Question:  The Decagon House Murders borrows its basic plot structure from an Agatha Christie novel first published in which year ?
Sentence (from "The Decagon House Murders"): Borrowing its basic plot structure from Agatha Christie's "And Then There Were None" (Christie's book is directly referenced by some of the characters at several points), it tells the story of a group of seven university students who travel to a deserted island that was the scene of a grisly mass murder six months earlier, where events soon turn ominous.
Relevant evidence: Yes