I really recommend this. There are a lot of books out there. A lot of them go for the same themes. Some are boringly similar, some other are quite original. If you combine off-road theme with originality you get something like the Fever series. Action packed mysteries all over the board, a thoughtful main character and complex characters. Seriously, it was so good I read it in 1 day and a couple hours. (671 pages!) 
 A lot of people complained that it was impossible to guess about the mysteries in the book (view spoiler)[ The book could imprint on a fetus, the identity of the King, Barron's sons etc (hide spoiler)]. I actually like that fact that you can't guess everything. Don't you like a good "Didn't see that coming" moment? Well I adored that. 
 For once, being out of the loop on a series paid off : I could read them all back to back. Awesome!