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This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
Delta Fierce! 

On loan for a local assignment, Max "Caveman" Decker already feels at home in the backcountry of Wyoming. Protecting one woman—even petite spitfire Grace Saunders—is a vacation to the Delta Force warrior. But Grace thinks something darker is at work than the murder she witnessed. It wasn't a case of the wrong place at the wrong time—it was her "curse." Every man she gets close to dies. Now she's saddled with Decker, her sworn protector, who won't leave her side. Any hope for a simple assignment will change once they're living under the same roof, where Grace's curse will be just as inescapable as the crosshairs of a killer.