Okay, I've got a couple of recommendations for the letter N, both by Roger Zelazny.
Nine Princes in Amber: The book that kicked off the whole Amber series (and its sequels and derivatives). It's the story of a complicated, often deeply flawed protagonist who, despite his otherworldly origins, is one of the most human characters in Fantasy. It was also my introduction to the Unreliable Narrator trope.
A Night in the Lonesome October: Apparently someone bet Zelazny $50 that he couldn't write a story that would have people cheering for Jack the Ripper as the hero. Boy, was that guy wrong. Quirky, macabre, and witty, and told from the point of view of a dog to boot. It was Zelazny's last book, and arguably one of his best.