Answered By: Alyssa Mitchell Last Updated: Jan 31, 2017 Views: 5688
According to current U.S. copyright law, items published before 1923 are in the public domain. Specifically for Agatha Christie's works, this means that only 2 of her novels are in the public domain. They are The Mysterious Affair at Styles (1920) and The Secret Adversary (1922). The rest of her novels will enter the public domain between the years 2019 and 2073. This is based on current copyright law that states that the copyright term on a work will expire 95 years after publication date.