Clara Oswald shivered as she hurried down the TARDIS corridor. She didn't know why the ship didn't like her, but after going for a swim in the Olympic-sized swimming pool, the ship had forced her into the corridor by way of a series of hologram leopards and closed the door behind her with something that sounded suspiciously like laughter.
For the past hour, she had been wandering in circles as the ship progressively increased the cooling systems. She was almost ready to give up when she saw something odd in the corridor ahead.
Most of the TARDIS looked the same, cold blue steel corridors that twisted randomly, always leading either a) nowhere or b) to the same place every time. There was a gap in the steel, filled with a plain white door that looked as out of place in the machine as she did. As Clara approached, she realised that it was covered in writing-some of it ancient, some as if it had been done yesterday. If you could say there was such a thing as yesterday in the TARDIS.
Clara took a step back and began to read.