The Secret of Chimneys

About 8 hours 15 minutes to listen to — 74,617 words, read aloud by a clear computer voice. It keeps playing with the screen locked, and works offline once the voice has downloaded.

"The Secret of Chimneys" by Agatha Christie is a suspenseful detective novel written in the early 20th century. The story introduces the charming Anthony Cade, who finds himself embroiled in a web of intrigue involving royal secrets and political machinations in a fictional Balkan nation known as Herzoslovakia.

Summary from Project Gutenberg.

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