Reddit reviews Home Land: A Novel

I was going to suggest the Broken Empire series by Mark Lawrence, but it looks like 2 people already beat me to that. I'll just add that I loved that series. The hero is like Machiavelli's wet dream.

Mark Lawrence's new series -- The Red Queen's War -- also features a hero that's not very heroic.

Fight Club, by Chuck Pahlaniuk also fits. But really, most of Pahlaniuk's work features protagonists so amoral that they're practically nihilistic: Choke, Survivor, Rant: the Oral Biography of Buster Casey, and the (in my opinion) under-rated Lullaby.

I'm also tempted to suggest Home Land, by Sam Lipsyte. But its hero is probably more cynical than amoral. It's about a guy whose high school nickname was Teabag (for probably obvious reasons). His high school reunion is coming up, and he's sending letters to the alumni newsletter. According to his updates -- which for some reason aren't getting published in the newsletter along with everyone's anniversary and birth announcements and stuff -- he's not doing well. The book is hilarious. But it also ends with some form of redemption, so it might not be what you're looking for.

Edit -- I should have also suggested I, Lucifer, by Glen Duncan. I mean, the protagonist is the Devil. He's not really completely amoral, but I think it fits, since he's telling his side of the story.