The Doctor sat in his study reading quietly. The City had its mysteries, and they were not going to reveal themselves. Downloading the public archives had so far not yielded enough answers.
The TARDIS had had only one true master for a thousand years, but it had many visitors. Three of those vistors had been able to forge a symbiotic link with the living time-ship, albeit two without knowing it happened.
The TARDIS sprang to life around the Doctor, powering up for a fold through time/space. It was an ancient, sometimes unreliable ship, but piloting itself was normally something that did not happen.
VWOOORP, VWOOORP, VWOOORP! The ship proved that the closest distance between 2 points is a wormhole.
As the TARDIS set down somewhere new in The City, The Doctor wondered why the hell his ship and home decided to move on its own.
The last time it did, it took him almost 2 billion years into the future. "Oh what now?" The Doctor peered into a monitor on the central control panel in the center of the ship.