The hier of the dynasty

A majestic, huge castle rises along the banks of the Rhine. This castle is not on any map and you cannot find a word about it on the Internet. It is home to the Secret World Government, an ancient royal family with thousands of years of history. The king and queen have grown old and are looking around for heirs. Their daughter Nesia, who is to inherit the throne, has been traveling the world for 20 years to get to know it. Their son Henry has dedicated himself to healing people. Their grandchildren live the lives of commoners and are unaware of their royal lineage. But the King and Queen have decided it is time to begin their education. To prove their worth, the grandchildren must go through a series of trials and tasks that will test their intelligence, wits, and courage.
At the end of the story, they all gather in the big castle, and hidden secrets are revealed. Nesia returns from her travels to take the throne and begin a new golden time for the Secret World Government.