"Right, yeah, no, it's nothing," he said, trying to brush it off. But in his mind the smell was taking him right back, making him awake buried memories. They could be hard to ignore.

He shook his head and followed through the door behind the Doctor. He wished he had something in his hand, he felt naked without it. It didn't need to be a gun, just a torch would do; something to keep his hands occupied.

"So we're seeing things now," Jack said, stating the obvious. "You know a couple of years ago my team started seeing things. This guy, he wanted them to open the rift, was trying to persuade them using people they cared about. Everyone saw someone. Everyone. Well, everyone except me."

He turned his head back over his shoulder, certain he could hear something behind him. He ignored it.