For clarity, you're stating that at the end of the dialogue, instead of appearing in the next area (trapped in a cell), the game crashes? Or is the game crashing, and upon reload you're in the house but can't leave?
If you are appearing in the cell, but can't figure out how to get out of the cell, here's the wiki: http://www.exiledkingdoms.com/wiki/inde ... ous_Letter
If the game is crashing at that point, it might be due to a low memory issue with your device, esp if you're using an older device or a device with a lot of back ground apps. Because there's a map switch at that point, it could be nudging your RAM needs passed the available amount.
If the game is crashing, and your device and memory is fine, than I am curious to know how this resolves.