1896. Trouble in Zanzibar? The Edgbaston Sisters to the rescue. Harriet and Khuwelsa are teenage sisters and they love flying over the grasslands in their flying machine: The Pegasus. But East Africa is a cauldron of political tensions as the global empires of Britain and Germany vie for control. When the sisters stumble into the middle of a German military build-up, they are taken prisoner to prevent them revealing the truth to the British. To prevent a war they must escape their captors and warn their father in Zanzibar - but even if they succeed who will believe a couple of teenage girls? To stop the