The Killing Fields — Warren Murphy; Gerald Welch

SUGAR AND SPICE
...and carbon-fiber bones.
The woman known only as "14" has been genetically modified and trained from birth to be a ruthless killing machine - no mercy, no questions asked, and no survivors.
In St. Louis, her latest killing spree has left dozens of innocent victims dead, and the questions are stacking up as fast as the bodies: what is her next target? Why is she doing this? And, most importantly, who is the mastermind behind the carnage?
Stone and Freya, the deadly brother-sister duo, are sent to stop the bionic killer before she strikes again. They've been trained in Sinanju, the greatest of all martial arts, so they expect it to be a quick and easy mission. But they were wrong - dead wrong.
As 14 and Freya develop an uneasy friendship, they discover an even greater threat: a diabolical dictator, hell-bent on destroying the United States in a nuclear holocaust
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ABOUT THE SERIES:
This action-packed new series is based on the wildly popular "Destroyer" series, which has sold more than 50 million copies worldwide. Gerald Welch and "Destroyer" co-creator Warren Murphy have collaborated on LEGACY to bring the mythical martial art of Sinanju to a whole new generation of readers.
Be sure to check out other books in the Legacy series: Book 1: "Forgotten Son," Book 3: "Overload," and Book 4: "Trial and Terror"