The Fall of the Raughan Empire

Aneya Sadani and her twin, Aran Sadani, didn't even know their dad a few weeks ago. Then, one day, guards from the Raughan Empire come knocking on their door. They announced that our father was the king of Raughan, and we were supposed come with them to live in the castle and learn how to be proper heirs. There was only one problem: Raughan, while the most powerful empire, was known for its brash and hurtful environment, and the king was no different. Her mother recognized that, and refused. The guards then took her instead, turned her into something she wasn't - something evil - and took her to the castle. The last words her and Aran heard from their mother was to get the address from the hidden closet, and run.
Now they have to get to that address and figure out what to do, but being heirs to something as powerful as Raughan is bound to have more than a few targets at your back. Can Aneya and Aran get through without getting captured or killed?