A sinister plan ignites not-so-spontaneous combustions in an explosive thriller from the New York Times-bestselling author of the Stillhouse Lake novels.   A prostitute's client in Dallas. A jogger in El Paso. A pastor in Louisiana. Across the South and Southwest, middle-aged men are bursting into flames.    In the Office of Environmental Hazards, one man is on the case. His initial observations point to something in the drinking water. But intelligence agents suspect something much more ominous: terrorism.    Someone somewhere has come up with a diabolic weapon that could attract millions of dollars from the most dangerous people in the world, those with no conscience, no loyalty, no morality. And two women in Dallas--a sex worker and a thief--find themselves thrust into the middle of a conflagration that could raze everything in its path . . .    Praise for Rachel Caine   "A first-class storyteller who can deal out amazing plot twists as though she was dealing cards." --Charlaine Harris, New York Times-bestselling author of True Blood