I have 6 spots on my backlog so I’m looking for a good 6 book series or a bunch of series that equal up to 6 books.

The series I have right now are:

– A Song of Ice and Fire – George R.R Martin

– Harry Hole – Jo Nesbo

– Kingsbridge – Ken Follett

– Century – Ken Follett

– All the Final Fantasy novels that are based on the games

Those books along with Gone Girl, some manga series and 3 non – fiction books equal 44 titles.

I'd like to have a total of 50 books on my backlog.

If you can recommend a good series that equal 6 books or a bunch of series that add up to 6, so for example 3 and 3 then that would be greatly appreciated!

Also, if you have 6 book stand alones you want to recommend to help fill the gap in my backlog then you're more than welcome to share them.

Thanks for the help!