Fiction and especially science fiction works best when the characters are believable and the situations and conflicts, as crazy as they can be, are made to seem possible. Seth Baker does a remarkable job of this in the novel "Reaction (End of the Iron Age)". He does it without resorting to tired SF cliche's. The story is perfectly paced, you aren't going to be bogged down as the writer spends pages and pages describing the exact function of a weapon (ala Tom Clancy) or spend agonizing pages torturing your way through a recap of the whole point (Ayn Rand).
This book is fun to read.
It is set in the not too distant future and the world described is not all that different from where we are now. The differences are always interesting as the main character, Amadeus, is forced to travel the globe to clear his name, avenge his father, fight 'demons' and shut the gates of hell or where-ever. It never takes itself too seriously or too lightly, as a matter of fact I think it struck the perfect balance.
It is a book that you will be glad isn't too short. I haven't read a lot of Seth Baker stories but this one makes me want more.