A Pilgrim

Either a sequel or a spin-off to two previous stories by the same author. There is zero on-boarding for newcomers to this series, so start with Antique Panzitoum or Old King Nebb instead, will maybe help explain things better. You're a septuagenarian on a hike between two major settlements, stopping off at an old building for a night's sleep. Some light exploration, a couple of basic puzzles, and a dollop of intriguing world-building, and you're done. Elaborate prose style with pleasing turn-of-phrase evokes Arthur Machen. Puzzles avoid frustration.