The setting is 15th century Poland. It was a time when heretical ideas lead those to who possessed such a mindset to being burned at the stake for their beliefs.
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The protagonist, Rafal, a child prodigy, is expected to major in theology, the most important subject at the time, at the university.
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One day, however, he comes across a mysterious man, and is now studying a possible "truth" in the midst of heretical thought!