In the brief moment of respite, or at least, no immediate threats to Earth and mankind, until the next one came along, Captain Jack Harkness had left the Hub to his team's devices, heading down to London for a day to tie up a few loose ends. Well, mainly to check up how Mickey was doing, after exchanging a couple of emails over the last few weeks. He didn't really seem able to lose the guy. Well, not that he didn't care, to be honest. He'd also paid Martha Jones' family a visit, having become close friends with them since 'the year that never was' and even checked up on how Donna Noble was doing, though without approaching her of course. The poor woman didn't remember him anymore after all.
The captain stepped off the train in Cardiff station, as always dressed in his World War II-style RAF coat, and walked back towards the Millenium Centre. Thinking back on the big events that happened recently, he wondered how the Doctor himself was doing. If he was still alone... Jack gave a soft sigh at that thought. He'd love to be a companion again, to travel beyond the stars with the magnificent TARDIS, but he had Torchwood. Like Martha, he had people depending on him, whom he couldn't just leave behind. True, it was a time machine and technically he would perhaps only be gone for a few minutes, but as was proven by meeting the Master at the end of the universe, anything was possible.
He was pulled out of his thoughts when he noticed someone jumping on the tiles around the fountain, obviously searching for the secret elevator into Torchwood's base. Well, if they knew of the elevator, they probably had some kind of clearance, the immortal thought and walked up to the man, then grinned overhearing his shout. "I don't think Jack's down there, mate."