Unobtainium Series by Niall Teasdale

Kate should not exist. The product of a mad scientist of great talent, she is the fusion of man and beast only made possible but the power of the Wonder Metal, Unobtainium. When Charles Barstow-Hall’s grandfather discovered Unobtainium in Scotland, he had no idea that it would change the world, and even less idea of the extent of that change. Thirty-five years later Charles still spends much of his time cleaning up after the messes made by those with less moral fibre than himself... moreKate should not exist. The product of a mad scientist of great talent, she is the fusion of man and beast only made possible but the power of the Wonder Metal, Unobtainium. When Charles Barstow-Hall’s grandfather discovered Unobtainium in Scotland, he had no idea that it would change the world, and even less idea of the extent of that change. Thirty-five years later Charles still spends much of his time cleaning up after the messes made by those with less moral fibre than himself. When he discovers Kate, a truly ungodly use of his grandfather’s discovery if ever there was one, he determines that she must be cured of her unnatural condition. But there are other men with other ideas about Kate’s future and soon Kate and Charles, together with their friend Antonia Wooster, must brave the perils of the Dark Continent to bring an end to the vile schemes of evil men. less

After dealing with a domestic issue of murder and Unobtainium, Kate and Antonia accompany Charles back to Africa. They are expecting an easy journey of exploration, but they discover something in King Solamet’s mines which takes them far further than they expected.