The Roof of the World is a perfect Example of a Story with great Concepts and some stellar Execution that at the end just kinda places itself as 'okay'. The Setting and its external Factors seem something worth exploring at first, but there isn't much done with it for the most Part. The whole Idea about Erimnem 'dying' is quite interesting and does bring some great Moments with both Peri and the Doctor. It being Dialogue-focus seems great at first, but sadly the Dialogue isn't as captivating for the most Part as I would like it to be, overall not bad, not particular good just a perfectly average Story.