Goodreads
Goodreads asked Michael McGarrity:

Where did you get the idea for your most recent book?

Michael McGarrity See above. In the twelve Kevin Kerney novels I was constantly adding to his backstory and when I decided to elaborate on it, it grew into a prequel trilogy, supposedly the first of its kind. "Residue" simply continues that story. What happens after "Residue", I have no idea. I take it one book at a time.
Michael McGarrity
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