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.

In East Africa, sisters Harriet and Khuwelsa Edgbaston set off in their steam-powered ornithopter on the trail of butchered hippopotamuses and their stolen teeth.

Harry and Sellie are at home when the building comes crashing down around them.

Harry is nosy and that winds them up in all kinds of trouble. But this time it's different.