After A Case of Conscience
The Shadow of the Torturer by Gene Wolfe
If Blish's Jesuit priest wrestling with sinless aliens left you craving more theological vertigo wrapped in speculative fiction, Wolfe delivers a guilt-ridden torturer seeking redemption in a decaying empire where grace and damnation blur into shadow. Same unflinching collision of faith and science, but the heresy cuts deeper—demanding you excavate meaning from every layered sentence like a spiritual archaeological dig.