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"In the" sounds like it's going on for a while — a chapter or two. "At the" sounds like a point on a line: he describes everything in one or two paragraphs and then moves on. Both are grammatical...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/2524 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/2524 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/