Rulers of the Underworld

Luke and Christine were once ordinary twins. They once lived in a normal neighborhood, went to a normal school, and had ordinary friends. But that was a long time ago. Now, they live in their house with their mother, unable to get out. They're stuck with doing ordinary chores until they stumble upon the forbidden attic. Although very suspicious, will this exploration lead to something better? Or will it make their lives worse than it is? As they say, 'Curiosity killed the cat."