I've always been a big fan of Heinz-Harald Frentzen. Even though he's 36 this year, he's still one of the top five drivers on the grid. It's unfortunate that he's been in a downward spiral since his shocking dismissal at Jordan in 2001 (Eddie shot himself in the foot!).
Hilton's book is very complementary of HHF. He gives some insight as to HHF's youth and family life, something that you don't find elsewhere. Hilton interviews a lot of people that have worked closely with Frentzen, including former mechanics, fellow drivers, and team managers. I think you get a good idea of HHF's personality and driving style from Hilton's book. He's truly a gem among F1 drivers, without the selfishness and complaining that you hear from most of them!
Hilton spends much of the book talking about Michael Schumacher in order to illustrate Frentzen's speed on the track, as well as his laid-back style in the pits. While there aren't any quotes from Schumacher himself, Hilton uses interviews with Alan McNish, Johnny Herbert, and Karl Wendlinger to illustrate his point. Frentzen was always faster than Schumi when they had equal equipment!
While it has a "cut and paste" quality to it (insert driver's name here), overall, I would recommend it to any F1 fan who wants to know more about one of the truly great drivers in Formula One today.