This is for the Read Agatha Christie 2024 challenge by The Official Agatha Christie website.
https://www.agathachristie.com/news/2024/read-christie-2024

This year's theme is The Decades. Each quarter of the year will be a different decade in which any Agatha Christie story was written or published in. So if you already read the official pick or want to explore a different book, you are free to do so as long as it falls under the decade. #ReadChristie2024