Prime Video’s “The Summer I Turned Pretty” is set to make a splash, and maybe even some waves, with author Jenny Han having adapted the first book of her beloved trilogy into a new TV series — which has already been renewed for a second season. And while the book was first published in 2009, Han delighted in revisiting — and changing — her original story.

“It’s such a delight to be able to revisit the story that I told so long ago and think, ‘Okay, what would I do differently? What would I do the same? How different does it feel to tell the story in 2022?’” Han said in a recent interview with TheWrap.

The story follows Isabel Conklin (Lola Tung), nicknamed Belly, as she embarks on the summer of her 16th birthday, spending it where she always does: her mother’s best friend’s family beach house. Susannah Fisher (Rachel Blanchard...