Chapter four

The Doctor didn't look scared. In fact, he just stood up, his face unruffled. But Jessie was good at reading people's faces and could see that inside he was scared, even though he stood powerfully and bravely. "Who are you?" asked the lady.
"More importantly, who are you?" asked the Doctor, his voice suddenly turning dangerous. The woman looked confused. "I'm Susan Carter…" she said slowly.
"No you're not. Susan Carter was dead this morning, and now she's not. So what is the creature inside?" he asked impatiently. 'Susan' put her head on one side and stared straight at the Doctor. "I wasn't dead," she said, in a truthful voice that didn't sound as if she was lying, "I fainted. I hadn't had anything to drink all day, or eat, and so I fainted. But my friend helped me…" she smiled, "So I'm ok now." Jessie stared at the woman. She could tell that she was lying, even though 'Susie' sounded very convincing. She could tell by the way she stood and moved. "You're lying." she said boldly, before she knew what she was saying. 'Susie' looked at her. "How can you know that?" she asked in a sharp voice.
"Because I can read body language. The way you stand…you're lying." explained Jessie in a calm, knowledgeable voice. The Doctor stared at her.
"But this is the way I stand."
"Yes but you looked to the left. Anyone who lies looks to the bottom left." persisted Jessie. 'Susie' pursed her lips.
"What are you doing in my room anyway? Get out!" she snapped, her eyes glinting dangerously. There's something not human about her. Jessie thought. The Doctor grabbed her arm and pulled her out the room. They walked down the stairs, completely forgetting to be quiet and to whisper. "How can you read body language so well?" asked the Doctor.
"I just can. I could see you were scared in there, though you stood bravely." explained Jessie, not making eye contact with him. The Doctor's face froze. "Strange…" he murmured.
"What?"
"Well…it's just that…" But before he could answer Jessie's Mum came through the door, hands on hips, staring up at them.

"What the hell did you think you were doing?" Lydia shouted at Jessie. The Doctor leant against a wall, staring into space. Jessie was sat awkwardly on a chair, looking at the Doctor now and again. "I was…I was…looking for something I dropped at the party…" she mumbled. Jessie's mum slapped her and the Doctor looked shocked. Jessica clutched her cheek, which was flaming red. "You're lying! Why would you bring this man with you? Who is he anyway?" she yelled, her voice breaking. Jessie didn't answer and her mum slapped her again. She still didn't answer. She was about to slap Jessica again, but the Doctor pulled her back. "What do you think you're doing? Get out of here!" ordered Lydia, pulling her arm away from him. She raised her arm to slap Jessie."STOP!" the Doctor yelled. Jessie and Lydia looked in amazement at him. His face was like thunder. "What's the point in hitting someone? It's my fault she was out of bed at this time. We were looking for her phone." said the Doctor, saying the first thing that came to his head.
"Yes but why are you helping her? Who are you?" she snapped.
"I'm…her…teacher." the Doctor said, trying not to hesitate. Jessie could hardly believe he was sticking up for her. "Oh…and why were you here?" Lydia went on, tapping her foot, which Jessie knew was a danger sign. She would start shouting and banging in a second. "I was out here as well, looking for something. Then she came along and I said I would help her find her phone." the Doctor went on, without hesitation. He sounded very convincing. In fact he was so convincing that Lydia relaxed and stepped back.
"Well," she said, her voice softening, "In that case I will stop shouting at you Jessica. But you are to go straight back home, and you will still have a very bad punishment for getting out of bed at night. The house might have been robbed with no one in it!" Jessie's face fell and she scuttled out the room. The Doctor took a long, stern look at Lydia, who looked back just as evenly. Then he departed from the room and to where Jessie stood. "You'd better get back home." said the Doctor, nodding towards the path.
"What? I'm not…!" she protested. The Doctor put his finger to his lips. Jessie looked puzzled. "I'm only saying that so you're mum isn't suspicious. We'll go back to the TARDIS when we get to your house." he whispered. Jessie nodded, grinning. They started down the path.

"Does your Mum always do that?" asked the Doctor.
"What?" Jessie asked.
"Slap you?"
She hesitated. "No…that was just in front of you. She normally hits me harder…" she said, embarrassed.
"Blimey. I can't bear to imagine."
"You don't want to." There was silence. "I don't want to go back there, you know. Tomorrow they won't give me food for a week probably." Jessica said, worried.
"If we leave now then we can't sort out this "Mirror" problem." said the Doctor, "Which reminds me. I think I know what was wrong with the Susie Carter."
"What's wrong with her?" They reached the TARDIS and the Doctor put the key in the lock and opened the door. They stepped inside, shutting the door behind them. "An alien had come through the mirror, somehow, and taken over her body." he explained. Jessie seemed to be following this, so he continued. "She certainly isn't human anymore."
"So…what is she?" Jessie asked."I don't know. Until I know how they attack, I can't find out. But I found something else out. Susie Carter didn't blink at all when we were in that room. Which means the alien must have got into her through the eyes and couldn't control the eyes opening and closing." the Doctor said, sternly. "So something is hiding in the mirrors, and taking over people's bodies." said Jessie, slowly."Yeah. Except I don't think those mirrors are really mirrors…" he said.
"Well what else could they be?"
"I don't know, I can't know everything." The Doctor fiddled with some buttons on the controls, while Jessie stared into space deep in thought. Suddenly she looked back at the Doctor. "Do you think the mirrors are windows." she said. The Doctor turned to face her. "What do you mean?" he asked.
"Well, do you think the mirrors are windows from one world to another…and the aliens, whatever they are, come through the mirror." The Doctor stared at her wide eyed. Then he exploded with joy and kissed a surprised Jessie on the forehead. "BRILLIANT! You're absolutely right! Why didn't I think of that?" he exclaimed happily. Jessie beamed, glad to have worked something out. The Doctor set to work tapping buttons and Jessie stood and waited. Now they had to find out what the alien was!