3.

'What do you mean, it doesn't exist?' Immy asked in disbelief. 'I live there. Of course it exists!'

'I believe you, but look,' the Doctor answered, and he pointed to the monitor. 'Location not found. The Tardis can't go there if she can't find it.'

'I don't understand a word of what you're saying! What is a Tardis? I thought this was your house! Now that I come to think about it, this is a really weird room to have in your house… Where am I?' She looked shocked that she hadn't noticed this before.

'This is my house. Sort of,' the Doctor answered. 'It's a space ship and it can go anywhere in space and time, but it does need to find the location. And that's the problem here.'

'This is so stupid. If we had a car, we could just drive there. Where are we, anyway?'

'Brighton, 1899.'

'What? 1899?'

'I did say anywhere in space and time, didn't I?'

'What year are you from?' River asked. 'Hmm… Early 21st century?'

Immy nodded. '2024. If this ship can go anywhere, can't we just go to Cardiff and walk the rest of the way? I mean, Cardiff is still there, right?'

'It's worth a shot,' River said.

'Fine. Cardiff it is.' The Doctor started pushing buttons, and River joined him.

'Hold on tight!'

After only a few seconds, the Doctor ran to the door and opened it. Immy stepped outside. She turned around curiously to take a look at the spaceship, because she had never seen one before. She only saw a small wooden box. The Doctor watched her as she clasped her hand over her mouth. This was his favourite part.

'It's smaller on the outside! How did you do that?' It was different from what he usually heard, but then again, people didn't usually enter the Tardis without seeing the outside first.

'Let's go,' he said. He and River started walking, and Immy followed after taking one last look at the Tardis.

They were in the centre of Cardiff, and Immy said they'd have to walk for about half an hour. She led the way, going faster and faster as they walked on.

'See,' she said after a while as they turned right, 'this is my street! I told you it was here!'

Immy started walking even faster, taking longer strides, and soon she was a good 30 feet ahead of them.

'How do you think it happened?' River asked in a muffled tone, so Immy wouldn't hear her. 'How could she have appeared in the Tardis like that?'

'I have no idea. The Tardis is supposed to have shields and things to prevent this from happening. She came from within, somehow. I don't know.'

'Why can't the Tardis find her house?'

'Because it doesn't exist. She thinks she is walking to her house now, but I'm sure she won't find anything there. The Tardis would be able to find it if it was there. It must have disappeared, like the piano room.'

'Any theories?' River asked, looking up at him.

'I don't know. Somehow things around her seem to disappear. I don't know what causes it. And I really don't know how she could have entered the Tardis.'

Both of them looked at Immy, noticing that she had stopped walking.

'What's wrong?' River asked.

'My house… it's gone. It's suppose to be right there, at the end of the street.'

She pointed to the end of the close. There was a little park where the street ended.

'Your house is supposed to be at the end? In that little park?' River asked.

'The little park is supposed to be our garden. We live in an old church. You should be able to see it from here! Where did it go?' she asked the Doctor, as if she expected him to know the answer.

'You live in a church?' he asked, suddenly interested.

'Well, yeah, an old church. It wasn't being used as a church anymore and my parents decided to buy it. My dad has a thing for old stuff.'

'That's awesome, living in a church.'

'Where are my parents?' Immy asked in a small voice. 'What happened to them? They were home…'

'Let's go and look at the place where your house should be. Maybe we'll find something,' the Doctor said. Immy nodded, and they walked to the little park at the end of the street. They stood at the gate for a while, but the only thing they saw was grass and trees. There was no church there, not even a sign that there had ever been a church there. It was like it had never existed.

'Can we go back?' Immy asked after a long time. 'I'm cold.'

'Sure,' River said. 'Let's go back.'

When they got back to the Tardis, River took Immy to the kitchen for a cup of tea. They sat down at the kitchen table. 'Are you okay?' River asked. 'You look pale.'

'I don't know… It's just a bit much. I don't know where I am, I don't know what to do, I don't know where my parents are… What if I never get home?'

'Don't think like that,' River said in a reassuring tone. 'I promise you that we are going to get you home. Everything's going to be all right. Promise.'

Immy gave her a weak smile and took a sip of her tea.

'River!' came a voice from the control room. 'River? Could you help me?'

'I'll be right back.' She smiled and walked out of the kitchen. In the control room, she found the Doctor lying on his back under the console. 'What are you doing?' she asked.

'I'm trying to figure out how she could have ended up here. No luck so far.' He sat up and looked at her. 'Something must've gone wrong. I thought, maybe if we figured out what it was we could reverse it and we could get everything back the way it was. Wanna help?'

River shrugged. 'Okay,' she said, and lied down on the floor next to him.

They didn't find anything, and River gave up after a while. 'I promised Immy I'd be right back,' she said. 'She's probably bored out of her mind just sitting there waiting for me. If hasn't wandered off, that is.'

'She probably has,' the Doctor mumbled. 'They always do.' But River didn't hear him.

When she reached the kitchen, she found that Immy had indeed wandered off. She sighed. It could take hours to find her, if not more. The Tardis was big and she might be completely lost. She walked down the hallway and started trying doors. The first door was a cupboard, and she wasn't there. She tried the second door on the right. It was their bedroom, or one of them at least. This was the one they used most often, because it was closest to the control room.

She opened the door, and to her surprise, she found Immy lying in their bed. She was curled up like a ball and had pulled the duvet up to her chin. She was lying on the right side of the bed, the side where River would normally sleep. River walked over to her and brushed a few strands of hair from her face. She smiled. The girl deserved a good night's sleep.