Earlier this week, HarperCollins obtained the rights to all of Agatha Christie’s books. In honor of the news, today’s Free eBook of the Day is Secret Adversary by Agatha Christie.

The novel is a classic Christie whodunnit. Here is an excerpt: “Tuppence believed him. Although she disliked and distrusted him instinctively, she was inclined to acquit him of the particular motive, which she had at first attributed to him. She looked him up and down. He was a big man, clean shaven, with a heavy jowl. His eyes were small and cunning, and shifted their glance under her direct gaze.”

Project Gutenberg has the public domain free download.

For more free eBooks, check out our Free eBook of the Day archive.