Series? Or stand-alone books?
Most books I read are stand-alone books, but I think that’s partly because I don’t read a lot of mystery or science fiction/fantasy, which I think are genres heavy on serialization. My favorite series of all time would be the Harry Potter books, of course, with the Anne of Green Gables books following closely behind (and sometimes tied for the lead).
I also loved Stephen King’s Dark Tower series, and I think his work straddles this divide, in a way. Most of his works are stand-alone books, but the more you read of his work, especially the Castle Rock books, the more you see continuing characters and themes and the evolution of the setting. So while they are not “series” books, inhabiting that shared universe links them in a rich way that rewards the frequent reader.
This is my Booking Through Thursday post.