Another way of identifying the A, B, and C stories in Flash and Bones would be to look not at the cases, but the topics that are central to the story--here they are NASCAR, domestic extremism (in the form of militias), and biotoxins. As usual, Reichs weaves a lot of information into the narrative.
One of the things that distinguishes Reichs's books from some other mysteries is that the reader can actually figure out who the villain is; occasionally, this makes one wonder why Tempe has to be nearly killed before she figures it out, but at least there is no need for a long explanation of why the solution to the mystery came totally out of left field.
Overall, Flash and Bones is an enjoyable mystery.
"Ever hear of alienation of affectation?"