Not very deep. Just your regular sobby novel that throws road racing jargon left and right without a deep understanding. Probably enough to fool an occasional Sunday driver.
Turns out the author got into track driving at some point, and sitting around over beers bench racing he got an idea for the novel.
Now don't get me wrong, it's not bad, it's fairly solid, just very shallow. And really not about racing. Driving and racing is only used as a metaphor and a weak backdrop.