Big Macintosh only has one job - to take care of his family. Everything he's ever done has been in service of that. So what is he supposed to do when he feels that, maybe, his job is nearly finished?
Years ago, Daring Do discovered an ancient city, and a strange lock she couldn't open alone. A while ago she met Rainbow Dash. Now it's time to go back and uncover the secrets she once had to abandon.