Can anyone recommend a good mystery book that involves poison? Preferrably victorian times or earlier?

Please recommend books you have read or have been read by someone you know.

Poison plays a role in some of the Sherlock holmes tales penned by Sir Arthur Conan Doyle, including "The Adventure of the Speckled Band" and "The Adventure of the Sussex Vampire."

the villainous Fu manchuuses poison in the thrillers authored by Sax Rohmer.

And poison is the weapon of choice in "The Angel of Darkness' by Caleb Carr.

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