"The terrorist organization ISIS is after a deadly toxin that could be the ultimate weapon of mass destruction. The same toxin holds the potential to eradicate cancer. There is a frantic race to see who can get to it first, even as Caitlin Strong begins to assemble the disparate pieces of a deadly puzzle. At the center of that puzzle is an Indian reservation where a vengeful tycoon is mining the toxin, disguising his effort as an oil-drilling operation. This is the same reservation where Caitlin's great-great-grandfather, also a Texas Ranger, once waged a similar battle against the forces of John D. Rockefeller"--Amazon.com.