Still sitting down, she scoured the floor for useful items. She saw a large toolbox near the lift shaft, twenty feet away from her. It was next to a bank of moveable power sockets and there was a small white cable connecting the two.

Clara laughed to herself, recognising instantly what it was, a mobile phone cable. She felt a sharp pain on the left side of her stomach which caused her to double over.

She got up and walked over to the toolbox, opening it to find an older iPhone, with several large cracks running down the middle of the screen and a full battery. She pressed the home button, finding it wanted a numeric password. There was an option to make an emergency call, so she pressed the button on the screen. It rang in her ear.

"Hello, emergency, which service?" came the male voice at the other end of the phone.

"Umm," Clara thought what to do. "I need to speak to UNIT."

"Fire, police or ambulance only. Which service do you require?"

"Umm, police then." Clara guessed this would be the most useful.

"This is the Police, what's the emergency?" said another male operator.

"I need to speak to UNIT, that's U.N.I.T, the umm, United Intelligence Taskforce people. Yes, them."

"Who am I speaking to?" said the operator, the voice had a lofty air, as if expecting a prank call.

Clara had spoken to UNIT enough times to know how to get their attention. "My name is Clara Oswald, travelling companion of the... Doctor in his... blue police box called the... TARDIS, there has been an incursion." She emphasised her words.

The operator paused, she heard typing in the background. "Right, so let me get this straight, you are calling about a Doctor in a blue box. I'm afraid this is not a matter the police can hel-" there was a loud rustle at the end of the phone, and then a silence.

"This is Kate Lethbridge-Stewart of UNIT, am I speaking to Clara Oswald?"

"Hello Kate, yes it's me."

"Good to hear from you Clara, what's happened?"

"We have a Zygon problem, I've already saved the world but I thought you guys would like to, you know, come and swoop in, pick up the bad guys."

"Where are you?"

"I'm currently on the twenty something floor of the UT Tower building site." She took a large breath in, "The Zygons have captured past me and over ten million people who are lying dormant in every building in London with a blue crane. The cranes are creating a network which is turning some, not all, paper into monsters who are transmitting the people to the buildings, they are being pumped up with something that looks one hell of a lot like antifreeze liquid, and they are looking to make all of them immortal by capturing someone, well, immortal." She paused for breath. "Basically, a normal day at the office."

"Ok, I will send my team in," said Kate, "are you hurt?"

"A little, not badly." She lied.

"Where's the Doctor, is he with you?"

"Umm, no," Clara said looking down at her free hand. "I died, her brought me back from the dead, and he forgot everything about me. I guess you could say we are, umm, separated."

"I'm sorry to hear that," said Kate, "you made a good team."

"We did make a good team, didn't we?" Clara sighed. "Thing is, I've somehow managed to acquire a TARDIS of my own, you could say it's on loan from the Time Lords until I take it back."

"You have a TARDIS? What does it look like?"

"I can't tell you that Kate, don't want UNIT taking it. I only came back here for a change of clothes, can you believe it? It's like trouble follows me round or something!"

"You say you have already defeated them?"

"Oh yes, in about 1-2 hours I'm going to disable the network at the top of this crane and then the Zygons are all yours. They have all the people connect to some sort of wiring, when they released me I had some sort of violent fit for about five minutes, so you might have to deal with a few confused people wandering the streets." Clara paused, "the Zygon leader, Bonnie, she has taken my form, she falls off the top of the crane before it burns, not sure where she ends up. I didn't see you lot the first time around so I guess you guys turn up once we've left."

"Who is we? Who are you with?" Kate asked.

"Ashildr, a previous Viking who is immortal, she falls off the top of the crane with the Zygon who has copied me."

"I'm beginning to understand. I'll send a SWAT team to scope out, we'll come in once you are out."

"There's a map inside the green portacabin on the roof, shows the locations of all the affected building sites. The nerve centre is on the twenty fifth floor."

"Understood, will I speak to you again?"

"Probably not, not my phone."

"Until the next time then Clara, I'll be looking out for your TARDIS."

"I'm sure you will," Clara said, almost laughing.

"Bye." Kate hung up.

Clara replaced the phone in the toolbox. She went to stand up, feeling better for having had a respite. She decided to go up to the next floor and investigate further, going into the interior stairs, supporting her left side on the handrail. She came out of the door, turning left, edging around the main lift shaft wall. As she passed the corner, a soldier came in through from the fire escape, thankfully walking to Bonnie on the other side of the floor, the other way she would have been seen.

Clara continued along the wall until she reached the next corner. She took a quick look around and then put her back onto the wall, thankful neither Bonnie or the soldier were looking in her direction.

"Ma'am, we found these on Floor 22, along with a spotlight covered in a green bag. We believe they were used to signal the target."

"Do we know who it was?" said Bonnie.

"No ma'am, unclear at present."

"What is the status on Oswald?"

"Safely inside your pod for the last thirty, ma'am."

"Excellent work, soldier. I'll hold on to these. Join the others, we need to find the target."

"Yes ma'am." There was a loud footstep, and then the soldier marched back off in the direction he had come.

Clara took another look around, Bonnie was at a bank of computers facing away from her, there was a large red open coffin in the middle of the floor next to it. She was busy inspecting something in her hands. She set it aside, and Clara recognised her binoculars, along with the large set of keys.

Clara wanted the keys, they had been very useful to her. She looked around for a way to distract Bonnie.

"Commander calling tactical team," said Bonnie.

"Team leader to commander go ahead," said a soldier over the radio.

"What is the status on the intruder?"

Clara saw a large bank of power sockets in the far corner.

"Ma'am we are completing a ground area search, no sign as of yet, I will keep you updated."

"Copy that, you will find her and you will bring her to me," Bonnie sneered.

"Copy that commander."

Clara aimed the sonic sunglasses at the power bank and it sparked up with a large bang.

"Nice!" whispered Clara, smiling.

"Who's there? Tell me, now!" she heard Bonnie shout.

Clara went back around the lift shaft, out of Bonnie's sight to the rear of the computer console. She took the keys as silently as she could, and decided to take the binoculars as well. She then hid back behind the wall. She put the keys quietly into her front right pocket, and slung the binoculars diagonally over her shoulder.

Clara heard Bonnie walking back to the console and made her way back to the interior staircase, opening the door as slowly and quietly as she could. She went in closing the door as carefully as she had opened it.