Looking for a new book series to read. I have read basically all Louis Lamour, Jack Reacher, Clive Cussler’s stuff and Levi Yoder series.

I have also reads some fantasy stuff like the WOT series and the starlight series by Brandon Sanderson but truthfully the fantasy genre is not my favorite.

Looking for something more challenging than the adventure novels I have been reading (Reacher) but not as long as the fantasy stuff.

I was thinking about the Bourne series, but if I have seen all the movies would it ruin it for me? I like the action genre

I would prefer a series with a strong main character and at least 4 books in the series.

Thanks in advance for the suggestions.