Sabriel

After Sabriel figured out that her dad was in danger she ventured to the old kingdom where her dad lived. When she got to the outer walls of the old kingdom she met a general that knew about her father. He told her that her father saved the old kingdom by creating seals that kept all the dead people dead. This is when she realized that if her father dies then the seals would break and the old kingdom would fall. After her papers were checked she was allowed to pass in to the old kingdom.