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Certainly not - she only died in 1976!
Her two earliest books - "The Mysterious Affair at Styles" and "Partners in Crime" - are in the public domain in the United States only, because of the US-specific law that makes anything published prior to 1923 public domain. These books aren't public domain anywhere else (other than those few obscure places which don't have a copyright law at all, before some smart-alec points that out).
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