It could vary greatly depending on the specific novel. In some adventure novels, the prisoners' place might be a central location for mystery and intrigue, like a dungeon where secrets are hidden.
Well, in many adventure novels of that era, the prisoners' place was often used to create a sense of danger and suspense. It might be a remote island prison or a dark cell in an old castle. This location would not only confine the prisoners physically but also be a place full of unknowns. The heroes might have to overcome various obstacles like guards, traps, and locked doors to reach the prisoners, which adds a lot of excitement and twists to the story.