Books discussed:

Edgar Allan Poe, the Murders in the Rue Morgue: This is public domain; full text may be found here http://www.gutenberg.org/ebooks/2147

Charles Dickens, Bleak House: Also public domain, full text here http://www.gutenberg.org/ebooks/1023

Wilkie Collins, The Moonstone: Public domain, full text here http://www.gutenberg.org/ebooks/155

Arthur Conan Doyle, The Adventures of Sherlock Holmes: Public domain, full text here: http://www.gutenberg.org/ebooks/1661

GK Chesterton, the Father Brown stories: https://www.goodreads.com/book/show/541803.The_Complete_Father_Brown

Agatha Christie, Murder on the Orient Express and Murder at the Vicarage: https://www.goodreads.com/book/show/16304.Murder_on_the_Orient_Express

https://www.goodreads.com/book/show/16331.Murder_at_the_Vicarage

Dorothy Sayers, Whose Body: https://www.goodreads.com/book/show/192893.Whose_Body

Georgette Heyer, Behold, Here's Poison: https://www.goodreads.com/book/show/311135.Behold_Here_s_Poison

Margery Allingham, The Crime at Black Dudley:
https://www.goodreads.com/book/show/76633.The_Crime_at_Black_Dudley

Ngaio Marsh, A Man Lay Dead: https://www.goodreads.com/book/show/280847.A_Man_Lay_Dead

Josephine Tey, The Daughter of Time: https://www.goodreads.com/book/show/77661.The_Daughter_of_Time