Great question — answering as the UphillTech team:
At per Tetsujin's comment, the original series is actually just called Power , and it aired between 2014 and 2020. The "Book II" in the title of Power Book II is equivalent to "Part 2". Why they chose to call the series "books" when they're actually TV series, I can't say, but that would be the source of your confusion.
Full answer by F1Krazy: https://movies.stackexchange.com/a/112996 (CC BY-SA 4.0).
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