The Count of Monte Cristo (finally getting around to Dumas, thanks to free ebooks -- he reminds me of Balzac, but faster-paced)
The Three Musketeers, Alexandre Dumas
Twenty Years After, Alexandre Dumas
Aurora Rising and Elysium Fire, Alastair Reynolds
Divergence, C.J. Cherry (please, no more Foreigner books -- Cherryh has forgotten the value of an "antagonist" in moving the plot forward)
The Green Brain, Frank Herbert (screams "mid 1960s")
Thorns, Robert Silverberg (screams "early to mid 1960s" even though written later)
Revenger, Shadow Captain, and Bone Silence, Alastair Reynolds
A Tale of Two Cities, Charles Dickens
Several ebooks by contemporary NYC writer Zak Zyz: Hawks at the Diner, Xan & Ink, The Master Arcanist, The Right to Bear Arms, and Survival Mode
The Cook, Harry Kressing (hat tip JS)
The Confessions of Arsène Lupin, Maurice Leblanc
The Ministry of Fear, Graham Greene