ISIS is after a deadly toxin that has the power to be the ultimate weapon of mass destruction as well as the miracle cure for cancer. As a frantic race for it begins, Caitlin Strong tries to assemble the distinct pieces of a deadly puzzle.

In her highest-stakes adventure yet, Caitlin Strong faces off against a string of foes that just might include a striking Comanche girl with whom her beau's son has fallen in love, and even a mythic monster from Native American folklore that the tribe believes has risen to protect its land. As Caitlin's loved ones are threatened by the villains she’s pursuing; her own moral code is challenged. The future of her world is clinging to the precipice of a strong cold death.