The victim Ellen Montgomery of a kidnapping is locked in a dungeon underneath the captor's house, but there's something inside that makes the dungeon the absolute best place for the victim to be–something the captor doesn't know about. Think of what that could be and write a scene about it.
This is a good place for Ellen to be right now, because the dungeon leads directly to the police station. The captors has no idea about this. Ellen is within feet of being saved. Now it just need for someone to realize it.