Jack jerked awake when the sound of something crashing to the floor broke through his dream. He looked round for a few seconds, trying to pinpoint the origin of the sound.

Then he heard it again, it was coming from the operating suite.

He walked up to the doors and was about to look through the window when the door flew open and he was propelled backwards and landed in a heap on the floor. He was vaguely aware of the sound of rapidly retreating footfalls, but his attention was taken by the doors bursting opening again.

It was Martha and one of the nurses, their scrubs in disarray and what looked like scratches on their face.

Martha looked panicked and angry at the same time.

"Martha, what the hell is going on?" Jack said.

"Did you see him, which way did he go?"

"See who?"

"The Doctor, Jack. He came round as we were bringing him into recovery. He flipped out and attacked one of the nurses, and me."

Jack was up in an instant, suddenly recalling the footsteps he'd heard. "That way, where does that go!" he snapped.

"The fire escape," the nurse said.

As if to prove her right the fire alarm blasted into life.

"He's making a break for it!" Jack said and sprinted off in the direction of the fire escape. "Call the others, tell we have a code seven!" he yelled at Martha before he disappeared round a corner.

He had to get away, they were trying to hurt him. Someone had tried to stop him and he had lashed out, his primal instinct giving him strength.

He ignored the pain in his side and ran.

He barrelled through the door and paid no heed to alarm that went off. He stumbled down the metal steps, tripping himself up on

the tubing that was trailing behind him.

With a cry that was a mixture of pain and frustration, he landed heavily on the tarmac. He grabbed hold of the offending obstacle and ripped it away, leaving a bloody trial on the floor.

Only one thought filled his head...run.

Jack tore down the corridor and out of the open fire escape. He stopped and looked round, desperately hoping that the Doctor had collapsed nearby, but there was no sign of him.

He jogged down the steps and stopped again as he spotted a discarded IV tube, the end stained with blood.

Then he spotted the trail of droplets, they were heading towards...dear god, the railway. He set off again, slower this time, following the blood. As he was tracking his com beeped.

"I'm heading towards the railway, get over the bridge and cut him off that side. Don't approach him, just stop him from getting any further.

Jack vaulted the spiked fence that separated the railway from the road and wonder how the hell the Doctor had managed to get over it. He began wading his way through the overgrown grass that ran alongside the rails.

He stepped out onto the shale and looked left and then right and was relieved to see no train in sight. But that could change at any moment, this was the main commuter line, he glanced at his watch, it was nearly peak travel time. He had to find the Doctor and find him fast.

His feet hurt from the stones and were now burning from the heat of the metal under his feet; he had to find shelter and water soon. He spied something up ahead, it was dark, hence cool and he could smell water.

It would do for now, until he could figure out a way of finding the TARDIS. He stepped into the dark, feeling the coolness of the bricks under his hand as he felt his way along. He walked carefully but was soon exhausted.

He could hear the steady drip of water just ahead of him and a he forced himself the last few steps. He held out a hand and let the water drip into his hand and he tentatively touched it with his tongue, it was brackish but drinkable and he cupped his hands and greedily drank until his stomach told him to stop.

His thirst quenched for now he sank to the floor, it was damp and uncomfortable, but he was too exhausted to care. The pain from his side was now making its presence felt, painfully. He felt along his side and found what felt like stitches, but they were broken and fluid was seeping through them.

With a grunt of pain and disgust, he began pulling the stitches, humans and their archaic medicines, the stitches would only impair his healing. Gritting his teeth he pulled the last stitch and his body took over and he passed out, the one thing he didn't want to do.

Jack followed the decreasing blood trail, it eventually stopped, but Jack now had a pretty good idea of where the Doctor was. He looked at his watch again, time was against him.

His com beeped again. "I think I've found him. Ianto I need you to get hold of the rail police."

He walked along the track as he listened to the man on the other side. "I understand your dilemma Captain Harkness, but it would cause severe disruption. I can't shut down an entire network for someone who may not even be on the line. "

"Just for a couple of hours!" Jack pleaded.

"I'm sorry Captain," the voice said and the phone went dead.

"Dammit!" Jack shouted and kicked the shale. He re-opened his com. "Ianto, get Martha and get down to the south bound tunnel."

He closed his com and stepped into the tunnel, hoping that the Doctor was inside.

The darkness was all pervading; he couldn't see his own hand as he waved in front of his face. He shouldn't be frightened, he'd been in dark places before, but he was and he couldn't fathom why.

Then he felt it, that pressure, the feeling that something was coming, hidden by the darkness.

All he wanted to do was run...but how could he run when he couldn't see. The pressure kept building and building and his body screamed at him to run.

Something touched him and he lashed out.

"Get away from me!" he screamed.