This is very rare for me but I have to, at least, start a review before I finish the book (as opposed to the 50 books this year that I still haven't got around to reviewing).
Breaking Gravity is, in short, about what happens socially and economically if somebody discovers anti-gravity. The physics is shit! And I don't mean the actual hand-waving that permits and anti-gravity.
I wish I could remember who defined a fantasy as a story in which we had to accept precisely one impossible thing. I think that's a ridiculous standard, but a fine thing to aspire to. So, in this story, the impossible thing is the anti-grav device. Fine. But then we're told that on its high setting, this device launches objects into orbit—and yet, it only managed to embed a half filled coke can in a ceiling rafter, and nobody died. That's just to suggest that perhaps there was too much emphasis on making the science seem right (and failing) instead of concentrating on the real story.
And there's a heck of a story.
I couldn't possibly count the number of times I've lost interest in a thriller because somebody's trying to suppress a secret, and our hero could solve the whole problem by finding a few good journalists to break the story wide open.
It's exactly the same here, but... Dale Adams has discovered “free energy”. Obviously, that threatens everybody who profits from the energy industry, and no doubt a lot of people who you wouldn't expect. And Dale's far too naive to survive. But Dale is smart enough to know that he can just publish his plans, and then it would be pointless to go after him.
Except, he runs to his friends in the slum he grew up in, and they say “you've got a billion dollar idea, and you're going to give it away?
“What about us?”
So, after hundreds of thrillers, almost all of them written by people better known than Mitty Walters, somebody has finally addressed the question of, “if going public could save your life, why wouldn't you do it?”
And, I might add, he's highly entertaining while he does it.
“Mitty Walters”? That name sounds familiar for some reason. Oh, the secret lives that authors lead...
Now that I've finished, I have only one thing to add. The book ends very abruptly. That's unusual, but I can't say it's wrong. The story was done; I honestly can't say anything would have been gained by continuing.