Confinement/captivity stories - ideas and good reading?

As in the title. My WIP involves a character's lengthy imprisonment and eventual escape. Looking for examples of good confinement/imprisonment stories to get some inspiration, as well as general suggestions for doing this well.

It's an interesting challenge, as it needs to feel long and gruelling to make the eventual escape pay off well, but also needs to still be interesting throughout. The character is confined with others, but for various reasons they can't speak to one another, although can still interact non-verbally. There are conflicts that spring up here, and this section of the WIP is intercut with flashbacks so it's not too monotonous, but keen to make it all has momentum.

I've read and loved The Count of Monte Cristo but looking for other ideas.