I've seen this before and they usually end in disaster. A couple of them ended with the girl getting beat to a pulp, but surviving. They build up this fantasy world through letters, and when the convict gets out, the real world hits them square in the face.....sometimes literally. I used to work around convicts, and saw this all the time. I didn't mind it, because the girls were nutjobs and it kept them from ruining some decent dude's life.