That’s probably the abridged version you heard.

Before you buy or borrow and audiobook, read the description to see if it is abridged or unabridged. Many come in both versions.

As some said, could have been abridged. I’ve also seen with non-fiction that an updated edition will sometimes have new and expanded chapters, so listening to the original audiobook will throw it off

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Indices, bibliographies, and endnotes tend to be left out

Things that are edition specific may also be skipped depending on the audiobook you get!

Hi there. Your post would be better asked in our Simple Questions thread. It helps us keep the main subreddit focused around broader discussion rather topics which only apply to an individual. Thank you!