I believe that in a series-and I am thinking as much of series like Ferrante's Neopolitan books as in crime fiction- that each book should basically function as a standalone. You should not have to read the second book to understand the first one. It's okay to do this on a TV show, but not in a book or even a movie. Now Book 2 can give you a greater understanding of the characters or extend the plot but it should not be necessary to read it to understand the story.
Patricia Abbott is the author of more than 125 stories that have appeared online, in print journals and in various anthologies. She is the author of two print novels CONCRETE ANGEL (2015) and SHOT IN DETROIT (2016)(Polis Books). CONCRETE ANGEL was nominated for an Anthony and Macavity Award in 2016. SHOT IN DETROIT was nominated for an Edgar Award and an Anthony Award in 2017. A collection of her stories I BRING SORROW AND OTHER STORIES OF TRANSGRESSION will appear in 2018.