Prisoner of Disaster you mean.
Complete the "Rotten Relic" area in the story mode. Once you've done that, you might automatically be moved to the next area.
If so in the quest icon you will see a "World Map" button very close to the "Raid Boss available/unavailable" button. Click that, go back to area 1 and you will find all the Prisoner raids unlocked, each giving you 50 jewels the first time you beat it.