All Metaphysical / philosophical fiction Titles
Use for: fiction that explores, or is based on, some form of philosophy or system of thought, fiction where a significant portion of the content is devoted to the sort of questions normally addressed in philosophy

Herbert (Unabridged)
Nabarun Bhattacharya

Dissolution
Nicholas Binge

Remember, I Love You
Claudia Carroll

The Best Seat in the Universe
Grahame Anderson

Fire
John Boyne

Spontaneous Acts
Yoko Tawada

Wandering Stars
Tommy Orange

The End of Eternity
Isaac Asimov

The Evolutionary Void
Peter F. Hamilton

The Temporal Void
Peter F. Hamilton