The Adventures to the Ancient City

Lilly finds a seashell. Lilly and her brother, Leo, find out that the seashell is powerful. On one of their trips through the seashell, they land in a time warp and see their aunt when she was young like them. Their aunt's long-lasting friend told them that evil spirits are looking for a crystal that brings the dead back to life. Will Lilly, Leo, and their aunt find the crystal before the evil spirit does? Or will the evil spirit come back to life and destroy them?