Thriller Adventure Awaits

by Umberto Eco

You mentioned enjoying intellectual stimulation and puzzles, and this novel takes those to the extreme. It's a dense, complex work by the author of 'The Name of the Rose' (which you enjoyed), filled with esoteric historical and mythological references, secret societies, and a deeply layered narrative that will challenge and reward you.

by Stephen Fry

You like ancient mythology, and while this isn't a mystery, Fry's retelling of Greek myths is incredibly engaging and witty, offering a fresh perspective on stories you might already know. It provides intellectual pleasure through its clever narration and deep dives into the mythological foundations of Western thought.

by Robert A. Heinlein

You appreciate ancient history and the intellectual stimulation of puzzles. This sci-fi novel, while not overtly a 'mystery,' creates a fascinating puzzle by transporting characters into a post-apocalyptic future with its own strange societal structures and historical enigmas, offering a different kind of 'ancient' world to decode.