
Project Gutenberg | Kindle
An ambitious young reporter and a famous police detective attempt to solve a mysterious murder attempt on a woman in what is regarded as one of the first "locked-room" mystery novels, from the author of The Phantom of the Opera.
(Also available in the original French.)

Amazon | Project Gutenberg
In this collection of short mystery stories, an old man sits in the corner of a café, tying knots in a bit of string, and discusses baffling crimes with a lady journalist, offering his own suggestions about the true solutions.

Project Gutenberg
A brief, masterful study of the true purposes of law and government—written in the 1840s as a response to the socialism overtaking Bastiat's native France, but accessible and relevant in any century.
A free edition is not currently available for Kindle, though there are several editions for 99¢.