A race against time. A high-tech threat. A personal vendetta. And the ultimate sacrifice.

Allison Quinn is willing to risk everything to prevent the nation's worst terrorist attack.

Working undercover at Grand Canyon National Park, she is in position when cyberterrorist Blitz makes his move. But this isn't just another takedown—Blitz has sold kill codes to a third party, and if she doesn't intercept them in time, the nation's power grid will collapse, plunging millions into chaos.

Battling treacherous terrain and a violent storm, Allison chases Blitz into the depths of the Rio Grande. But as she dodges an elite assassin and fights for survival, one truth becomes clear—this mission is personal. Blitz is tied to the unsolved murder of her father, and she won't stop until she gets answers.

With time running out and lives on the line, Allison faces a choice: complete her mission or uncover the truth—no matter the cost.

Support and Defend is a relentless thriller packed with nonstop action, cyber warfare, and a hero forced to make the ultimate sacrifice.

The Allison Quinn Thriller series is a mainstream, high-stakes thriller for fans of Jack Mars, Vin Strong, and Laura Rise. Each book in the series can be read as a standalone. These books contain a small amount of adult language and violence, as is customary for the genre.

Vannetta Chapman is the USA Today and Publishers Weekly bestselling author of 50 novels in a variety of genres that include dystopian, suspense, romantic suspense, romance, and cozy mystery. Having sold more than one million copies, she currently writes full time and resides in the Texas Hill Country.