Stealthy Steps by Vikki Kestell

Gemma’s loyalty to an old friend entangles her in intrigue far beyond her experience. As the facts emerge, and the danger grows, Gemma is left as the sole keeper of a technology that evil forces want and are willing to kill to acquire. Gemma soon discovers—the hard way—that invisibility comes with its own set of problems. NANOSTEALTH, Book 1.