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"Now then…" The Doctor muttered, bringing up a floor plan of the Snow Globe on the screen of the computer system in the data centre. "Where are you really, Evie Jones?"

He couldn't believe what the screen was telling him. According to the map there was no trace of the teenager in the building at all. He changed the scanning conditions, changing the requirements to pick up any close to human life at all. But still there was nothing. Apparently the only living things within the Snow Globe were him, Santa and the elves.

"How is that possible?" He muttered, pulling at his hair and striding around the room. "Maybe…" He tapped at the computer system again, inputting different instructions. Still nothing showed Evie's location. "Elves don't lie… they can't. But that means. ARGH!"

This time his search had told him exactly what he needed to know. The creatures he'd thought were elves were not elves. They were a related, but completely different species altogether; Vola – the thieves of the elf world. Running his hands through his hair, the Doctor thought about what he'd found out.

Santa was working with the thieves to… to what? They had some kind of teleportation device in the building, but what did that mean? He pulled out the lists and laid them out on the desk in front of him. They were lists of children's names, the UK's children; the naughty and the nice. What was the importance of the lists? He was so sure that they meant something.

"Aari, Abigail, eight." He read the first name on last year's naughty list. Then his eyes flicked to this year's naughty list. Abigail's name was no longer on it. "Good for you." He muttered, checking the good list. Her name wasn't there either. Suspicion built up inside him. How had Abigail Aari disappeared off the lists? Maybe she'd moved and was under a different country… or maybe she was dead.

His eyes moved quickly between the three lists comparing them. None of the children from last year's naughty list were included on either of this year's lists. They couldn't all have moved to another country or died. The Doctor was worried now.

He moved to the computer, typing Abigail Aari into the system and waiting impatiently for it to check the records. She definitely wasn't on any lists for this year. Nor were any of the other children from last year's naughty list. They seemed to have vanished.

"So where are you?" The Doctor murmured his eyes wide as he stared at the blank screen.

x-x

"I asked who you were." Repeated the middle-aged, red-headed woman advancing on Evie; a spatula clasped tightly in her hand.

Evie took a step backwards. "I-I'm Evie… Evie Jones. How… how did I get here? Where even is here?"

"Don't play sill beggars with me, love. I wasn't born yesterday." The woman snapped, narrowing her eyes. "You obviously broke into my house."

"No… honestly, I didn't." Evie told her pleadingly. The woman's eyebrows furrowed for a moment and a look of uncertainty flashed through her eyes as she surveyed the teenager. She lowered the spatula slightly.

"Donna?" A shrill voice called from the hallway. As the red-head turned briefly to glance behind her, Evie's mouth dropped open. Donna? Surely this wasn't… his Donna.

Donna turned, catching the confusion and horror on the teenager's face before she had a chance to hide it. The woman's eyes narrowed as she realised this wasn't any ordinary burglary. The girl didn't look as though she went around breaking into other people's houses; although looks could be deceiving. There was something about her that made Donna feel unbelievably sad.

"In here, mum." She called and Evie jumped. A blonde woman entered the room and screamed at the sight of the teenage girl standing in the middle of her carpet. Her eyes flickered down to the laser blaster that was still clutched tightly in Evie's hand. Hastily the teenager tucked it out of sight in her waist band once more.

"It's Christmas Eve!" Donna's mother snapped, recovering herself. "How can you people be so heartless?"

"Me, people?" Evie repeated in confusion. Then she remembered what Donna had said about her breaking in. "No! Honestly, I didn't break in. I wouldn't do that. I don't even know how I got here." Her protests even sounded weak to her.

"Let's see what the police have to say to that." The blonde snapped, picking up the phone.

"Please… don't." Evie begged. The police thought she was dead, what would happen if they suddenly had to arrest her. Then something occurred to Evie and her mouth fell open in astonishment.

She was dead. Apart from her sisters, the only humans that had ever been able to see and hear her were ones that didn't exist in her timeline – either those who'd been born a long time before or a long time after her. The Doctor thought there was about a hundred year blanket where she was completely undetectable. So how could they see her?

Completely overwhelmed by this realisation Evie tried to do a runner. She pushed past the older woman and headed outside. Donna, however, was close on her heels and, as Evie reached the pavement outside the house, the red-head's hand closed around the teenager's arm.

"No!" Evie tried to wrench her arm away, remembering what the Doctor had said about Donna's brain burning up. She didn't want to stay here if there was a possibility that she could cause that to happen.

As Donna's hand closed around the girl's arm she got the strangest sensation. Images flickered through her mind, like they were coming from a television with terrible reception. She couldn't make them out properly, but the feelings they gave her… it was as though something had been missing, something that was just out of reach but was coming closer.

"Who are you?" Donna breathed, staring into Evie's eyes. "I… I know you."

The teenager shook her head vehemently. "No, no you don't. You can't ever know who I am." She said. Evie wasn't quite sure why she'd said that. Surely knowing about Evie Jones, an orphan from Shopshire, wouldn't hurt Donna.

"Why?"

Tears forming in her eyes, Evie just stared back, her face screwing up slightly as she tried to stop herself actually crying. Donna looked at her, a mixture of confusion and shock on her face. They looked at each other for a couple of moments before an old man appeared, breaking the moment.

"Donna? What's going on?"

"Gramps…" Donna breathed, letting go of Evie. The teenager didn't even notice and stayed rooted to the spot, taking quick, shallow breaths. "This girl broke in. We need to keep her in the house until the police get here."