He was the last of his kind, she was the only one of hers. Two different people, one blue police time traveling box, and a never ending adventure. The Doctor thought he knew all about the things living on planet Earth, Estrid thought that she will never found her other half after a thousand years of being alive...Join in the adventure of love, humor, smexiness and a whole lot of family drama.

There was a border. the only thing seperating the human world and the monster world. that, and a promise made thousands of years ago. is it really that bad to break that promise? or is Ash, this random teenage boy really about to get stuck in this huge mess, without knowing how to solve it?