Originally Posted by Cernan
The files came in one folder. There is an xml file along with 12 txt files, one for each chapter. I found Calibre when searching online, and I didn't see anything in FAQ to help with this particular question.
Did you try dragging the xml file to Calibre? With html files Cailbre would look at the html and gather all files zip them and create a book entry. It may be the same for xml files. give it a try.
Once in Calibre you should be able to convert it to ePub.