The Operation Jigsaw trilogy is Mark Hayden’s first published work.
When he decided to take his own route to market by publishing through Paw Press on Kindle, he did a lot of research and one of the most consistent pieces of advice was:
Have more than one book available.
So, he decided to write a trilogy.
The structure is a little like Steig Larsson’s Millennium Trilogy (The one about the girl with the dragon tattoo). This was entirely accidental because he didn’t read Larsson until after he’d written his books.
The first volume is more-or-less complete as a story but has some very large un-tied loose ends. The second and third volumes run almost continuously.
You can read about them in the Books section of this website.