Two sisters. One ornithopter. The African Savannah. Against an Army.It's 1896. Harriet (Harry) Edgbaston and her sister Khuwelsa enjoy their life flitting around the grasslands of East Africa in the ornithopter her father bought for her.But on a trip to see Lieutenant Schmidt of the German Army they become mixed up in what looks like becoming a major war.Escaping from captivity they must try to warn their father in Zanzibar - but who will believe a couple of teenage girls?