Agatha Christie's mysterious disappearance: What really happened?

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Author Agatha Christie has sold an estimated 2 billion copies of her works, second only to the Bible and the works of William Shakespeare. But as people continue reading her mysteries today, many have forgotten about the biggest mystery in Christie's own life — a sensational disappearance that took place not long after WWI. That disappearance is the focus of a new novel by Marie Benedict. Jeff Glor sat down with her.