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This is one of Agatha Christie's better murder mysteries.
The book has a unique structure, as events surrounding the death of Rosemary Barton are recounted through flashbacks from various individuals involved.
Authorities classified this as a suicide, but it's not a spoiler to mention that there is more to it than just suicide.

Agatha Christie occasionally experiments with the structure of her plots and viewpoints. It's not always successful, but this book is definitely a success.