Review of Griff the Invisible ...

That's a great insight: "Leon Ford avoids reinventing the wheel to a large extent by keeping the emphasis on Griff and Melody’s emotional lives rather than on derring-do."

The case could be made that Griff suffers from psychotic episodes. He is delusional.

I wrote a short post on Griff the Invisible called "Similarity Attraction Hypothesis."

If you would like to read it, I am open to any helpful feedback: https://christopherjohnlindsay.wordpress.com/2016/06/17/griff-the-invisible/