Borrowed Bones — Charles A. Salter

A lethal Unexplained Radiation Phenomenon in Puerto Rico baffles government scientists. The White House orders total secrecy and sends their top radiation expert Major Brad Stout to help. Struggling to control the spreading menace, Brad must also battle a mysterious terrorist group which interferes at every step and clearly wants him dead. If not halted immediately, the disaster will race over all Puerto Rico and then threaten the rest of the world… but there's a saboteur on the inside. And what motivates the lovely Lindsey Cowell to insinuate herself into Brad's life? Is she trying to steal him away from bride Mary Lou? With the deadly clock ticking down, whose bones must Brad borrow to finally solve the puzzle? And can he get them in time? This thriller grabs the reader by the throat in the first paragraph and doesn't let go until the last!