"I thought we were going to investigate this cave, not go hiking!" Sarah protested after a further forty minutes of walking.

"Well, its good exercise," the Doctor said

"And is your superb sense of direction working?" Harry said, slightly sceptically.

"Of course it is! It always does" the Doctor said, sounding offended. The wind was getting stronger as they went on and it did not make for an easy trek.

"You've dropped your hat, Doctor," Harry said, ducking to avoid getting hit with the scarf, as the Doctor swung round to look for hit lost hat.

"Would you keep still?" Sarah gasped, having taken the material full in the face. "I've got your hat." She jumped up to try and jam it on his head but couldn't' reach.

Finally the cave came into sight. Sarah started to feel weird again.

"Doctor, I don't like it here," she said, as the trio drew closer to the cavern. "I keep feeling that we're being watched, and I think we are."
"Oh, rubbish. I don't feel anything. It's probably just your imagination," the Doctor said, ducking so he could get into the cave. "You two stay here, I'll be back in a jiffy.'

"May as well have a rest," Harry agreed sitting down where he was joined a second later by Sarah. He was going to ask her something when he noticed she had the glazed expression back in her eyes.

"Are you sure you're OK, old girl?' he said. It was clear she was having serious doubts about it and she was not the only one.
"Why do we always have to come to places that mess with your head?" Sarah moaned, snuggling up against Harry's shoulder for comfort.

"Eh? How do you mean?"
The truth was that Sarah had been hearing voices in her head since they had come out of the soldier's building.

Why are you here? Go away, it isn't safe!

Don't listen to that. You must come to the Cavern!

The Cavern is evil! It will rule you!
No! Come to the Cavern!
Cavern...cavern...cavern...

"Sarah!" Harry started shaking her gently, starting to panic slightly.

"Voices," she whimpered in barely more than a whisper. "They keep arguing...I think I'm going mad!" Even so she was starting to calm down, and ended up telling Harry the whole thing, just as the Doctor returned.

"Well there's a welcome," he said cheerily in response to their ashen faces. "Come on, down we go!"
"NO!"

Taking Harry completely by surprise, Sarah slid her slim wrist out of his grip and rushed over to the Doctor.

"I am not going down there, and you can't make me!" Sarah half screamed. Harry was thinking why isn't the Doctor picking up on the fact something's wrong?

"Doctor, I really don't think-"he began but was cut off by a loud scream from Sarah who fell to the floor, tears streaming down her face and clutching her skull.