The sentence compares the captivation of the final installment to other books in the series, implying a high degree of captivation. The phrase "as ______ as" suggests a superlative or high degree. "Much" is used with uncountable nouns and to emphasize degree, fitting the context of captivation (an abstract quality). "Many" is used with countable nouns, "most" implies a superlative not fitting the "as...as" structure, and "more" suggests comparison but doesn't fit the structure. Thus, "much" is correct.
The complete sentence is: "No other book in the series captivated readers as much as the final installment."
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