Forged in Thunder and Fire by R.M. Wood

A kingdom invasion. A brutal commander. A princess in hiding. And secrets that can kill. Living under the protection of her brother, the King of the Isling Dwarves, Princess Darna concerns herself only with her lab and her inventions. When humans invade, led by the deadly Commander Thranet, they demand her and her most powerful invention to be used as an unstoppable weapon of war. Black powder, created with the sole purpose of aiding mining operations. Princess Darna stays behind during the evacuation of her home, knowing she has to destroy her life's work. Forced into hiding as a servant, Darna finds herself a chambermaid to the commander. Many dwarves were left behind, and they need leadership and reassurance. Many want to escape and reunite with their people, including Darna. But the commander is observant and has motives of his own. Watching her every move, Darna fears he knows more than he is letting on. Even though he comes to her aid and their goals seem to align, Commander Thranet is still human. Any deeper connection she may feel for him would be a betrayal to her people. And the discovery of who she really is means her black powder will bring destruction and death to countless lives. Read more