Recs if you like Shards of Hope (Psy-Changeling, #14)...

Limiting this to fantasy/sci-fi, these are books where the MCs are locked up for most of the book or it's a crucial part of the plot. This can include magical prisons, cursed towers, institutions of sorts, and probably more!

The Psy/Changeling-world is a paranormal romance series written by author Nalini Singh. Set on an alternate earth in the near future, there are three races: humans, changelings who can shapeshift into animals, and the psychic Psy. The Psy have been the predominant global leader for the past century, since the dawn of Silence in 1979. Their arrogance is starting to make their power slip...

Fantasy romance books I loved before they were called romantasy