Hell's Creek — Patrick Fox

After Bill Banes is killed in a spectacular but mysterious car bombing in England, O'Toole volunteers to go to London to bring back his friend's remains. Before he knows it, he's involved in a many-leveled conspiracy that becomes much more complicated than the murder it initially appeared to be.
O'Toole follows up on the one consistency in the sketchy chain of evidence: Bill Banes' continuing fascination with a 1978 earthquake in the western United States.

From the hundred mile visibilities at the peaks of the Little Belt Mountains, to the subterranean murk of the Lombard Fault in Western Montana, he is once again up to his ears in trouble, straying far beyond his jurisdiction as an employee of Structure -- the small and super-secret agency that does the jobs that are too sensitive for the CIA and the FBI -- and proving yet again that no good deed goes unpunished.

With the aid of Elmer Linthacum, who runs a small town Exxon station, and Becky Sparling, the loving daughter of a multimillionaire cattle rancher who has interests that go beyond his fourteen thousand acres, O'Toole manages to unravel the mystery and avoid getting sewn up -- or blown up -- in the process.