Hattie Brown versus the Elephant Captors

When Hattie Brown is tricked back to Somewhere-Nowhere, she's walked into a trap. There's a drought in the realm and Lord Mortimer, its brutal leader, wants to capture her and her friend Arthur because he knows they can make rain.
But Hattie isn't about to go home. She's discovered that Lord Mortimer has thrown her friend Victor into prison for his part in helping her and Arthur free an army of kidnapped children, and she's determined to rescue him. But in the cell next to him they find Lord Mortimer's brother, Lord Jasper. And Hattie discovers Lord Jasper is not only her father, but Arthur's as well.