Books with ASOIAF level fan theories, unanswered questions, and possible multiple culprits?

One of the things I love most about A Song of Ice and Fire isn’t just the world or the characters, but how much interpretation and speculation it creates.
Stuff like:

-Who really killed Joffrey
-What the Pink Letter actually means
-The Grand Maester conspiracy
-Weird background details like Arbor gold, shifting loyalties, and economic power
-Did Rob die twice
-Jojen Paste
-Frey pies
Etc

It feels like the books are deliberately written to invite debate, rereads, and endless fan theories rather than giving clean answers. The politics, misinformation, unreliable narrators, and long-running mysteries are as engaging as the battles.

I’m looking for fantasy or fantasy-adjacent / political /
historical-style books that create a similar experience:

-Lots of unanswered questions or slow-burn mysteries
-Events that fans still argue about
-Competing interpretations of characters’ motives
-“This could mean three different things” moments
-Dense enough that rereads reveal new implications

I’ve already finished The First Law trilogy.

Open to fantasy, or any other internal/external politics type stories similar to The Sopranos, Sons of Anarchy, Boardwalk Empire, Peaky Blinders, etc.

Thanks!