Is writing a story in a series of books the ‘in’ trend in book publishing these days ? There is the Harry Potter series, the Twilight series, Shades of Gray series, and many more

While this may not be a new trend, give that Lord of the Rings was a series written many decades ago, it seems that all new books are part of a series. Even Jeffrey Archer is writing a series and so is Amish Tripathy.

OR, could it be that I noticed this connection only after going through the Harry Potter series?