As Amy opened her eyes, she slowly and blurrily focused in on River, who was still out cold a few feet away. Her head was pounding, and she realised she must have hit it when they fell. She sat up, reaching over to shake River's shoulder. She gradually stirred, and was still wobbling slightly as she pushed herself up on to her knees.

"Ouch." She complained,

"You alright?" asked Amy,

River nodded, "I'm ok. Zara?" when there was no response her instincts went on red alert, "Zara?"

Both River and Amy scrambled up, looking all about them. As River coaxed a torch from her pocket into working, they had no idea where they were. It was some kind of cavern, the floor and walls were dark stone dripping with water and it was freezing cold. Looking up there was no hint of the crack they had fallen through. Zara was nowhere to be seen. In tandem the two of them called out for the girl, but they got no response. They heard the muffled notes of voices a little ways down and decided that would be the best way to go. They walked in silence for a little while, every now and then calling for the child. Amy turned to River,

"Why didn't you come and see us?" asked Amy,

"Why did you hide my brother from me?" responded River.

The atmosphere was awkward when Amy was lost for an answer. She stayed in place a moment as River walked on. She was overjoyed to see her, but she could tell her daughter was angry and worried and had no idea what would make her feel better.

"Zara!" shouted River as she disappeared round a bend in the tunnel, and Amy ran to catch her up.

The sound of voices was getting significantly closer but still there was no sign of the third part of their trio. They were so lost in thought that Amy didn't notice an obstacle on the floor and yelped as she fell forward, landing with a painful bang. River instinctively offered a hand to help her out although she was still in a less than favourable mood. They turned to look at what had tripped Amy and couldn't quite believe it. A ball of white fur yawned and stretched as an arctic fox looked up at them. It leapt quite happily towards them with a yip. River peered down at it,

"Zara?"

In front of Amy's disbelieving eyes, the fox stretched and changed shape, reforming into a seven year old girl with bare feet, who shivered as the cold air hit her. River and Amy instinctively reached out to hug her and she found herself quite dwarfed by them as they enveloped her.

"I'm glad I found you!" she said cheerily,

"Glad you found us?" Amy raised a good-natured eyebrow.

"Yep. When I came round neither of you were anywhere to be seen, so I figured I'd keep warm and stay in place. I knew you'd follow the voices like I did."

"Hang on though," pondered Amy, "We fell through the same crack. How did we end up in different places?"

"Teleport. Got to be a teleport," answered River. "A slightly worn one I would imagine, considering it couldn't keep more than two people to the same co-ordinates."

Amy nodded and turned to Zara, "Oh, before I forget. You're a fox now?"

"Come on Auntie Amy, you know about my dad, why are you so surprised?" Zara was genuinely confused,

"Well, yes, but he said the whole shape shifting thing doesn't kick in until adolescence. Kind of like alien puberty."

"Ew. Not something I want to think about thank you…" the girl pulled a face.

"It doesn't kick in early unless the process is overwritten by survival instincts." River explained,

"How come everybody but me knows about this?" Amy protested,

River looked at her and shrugged, "I took a module on ancient alien civilisations."

Her mother gave her a look, "But you're an archaeologist. Not an astronaut."

"I'm a time-and-space-travelling archaeologist from the 51st Century. I'm kind of both." Amy shrugged as if to say 'fair point'.

As Zara tried to hide her shivering, River took off her coat and without a word wrapped it around the girl's shoulder. The three of them carried along the tunnel, hoping to find a way out of sorts, although it was risky they decided following the voices would be their best bet. If they were friends or enemies they would adjust their manner accordingly. Things were still tense between Amy and River, and they flanked Zara, who was all too aware of the awkwardness that surrounded her. It was scarier to her than the thought of what was awaiting them. Suddenly River stopped dead, causing the girl to stumble into the back of her. Seeing the frozen spectacle in the middle of the tunnel, Amy paused too.

"Something wrong?" she asked.

"Listen." hissed River.

They did, and they heard nothing. Absolutely nothing. The voices had stopped. In a flash there was a great high-pitched roar as they were cornered into the middle of a ring of great stick-insect like creatures. They stood at a good eight feet tall and their antennae twitched towards them. They emitted a series of clicking like sounds. As they closed in on them River whipped out a gun from the ankle holster hidden by her jeans and Amy grabbed Zara close to her, standing in front of her protectively. River fired a shot and one of the creatures screamed, falling to the floor. Thick green liquid sprayed out of the wound and as the drops landed, the stone began to burn and hiss.

"Acidic blood. Great. River, maybe put that gun away."

In a rush of movement the three found themselves grabbed by the creatures, Zara kicked and screamed to get away from them, but she was so slight her efforts were easily quelled. The older women had little success, beating away the initial one or two that got too close. However, slightly smaller brown creatures had joined the fray from nowhere. They spat out some kind of yellow-green smoke and their heads began to swim as a feeling of nausea enveloped them. Zara watched, terrified as they slumped to the ground and were easily picked up and carried alongside her. She couldn't believe her ears as she heard one of their captors speak,

"The small one?" asked one of the brown insects in a gruff, deep voice.

"She is no trouble," one of the black ones, obviously female.

The child struggled, willing herself to change shape, something that could get away, but the black stick insect she had heard speaking rapidly caught up with her, "I wouldn't do that if you value your associates, Therian."

Zara stopped immediately. So, they knew what she was, but she was none the wiser as to what was carting her away.