"Get out," the Doctor said almost immediately.

"Doctor?" Donna asked.

"Get back in your rocket and fly away," the Doctor ignored her. "Tell your grandchildren you came to the Library and lived, they won't believe you."

"Pop your helmets, everyone," River said. "We've got breathers."

"How do you know they're not androids?" one of the women asked as everyone took their helmets off.

"Cause I've dated androids," River replied. "They're rubbish."

"Who is this?" the man Eva knew to be Lux asked River. "You said we were the only expedition, I paid for exclusives."

"I lied," River said. "I'm always lying. Bound to be others."

"Miss Evangelista, I want to see the contracts," Lux ordered.

"You came through the north door?" River asked. "Much damage?"

"Please, just leave," the Doctor said. "I'm asking you seriously and properly, just lea –" he paused, turning to look at River. "Did you say expedition?"

"My expedition," Lux said. "I funded it."

"Oh, you're not... are you?" the Doctor asked. "Tell me you're not archaeologists."

"Got a problem with archaeologists?" River asked him.

"I'm a time traveller," the Doctor replied. "I point and laugh at archaeologists."

"I don't!" Eva called out, causing River to turn and look at her.

"Eva!" River called out. "It's been too long!"

"It always is, isn't it?" Eva smiled at her, pulling her into a hug.

"You know her?" the Doctor asked.

"Doctor, let me introduce a past-future friend," Eva said, marking at River. "Professor River Song. Archaeologist."

"Nice," the Doctor said, peeling River's arm off Eva. "Maybe you can convince her to leave, and perhaps set up a quarantine beacon. Code-wall the planet, the whole planet. Nobody comes here, not ever again." He turned to see one of the women walking around. "Stop right there!" he told her. "What's your name?"

"Anita," she replied.

"Anita, stay out of the shadows," the Doctor ordered. "Not a finger in the shadows 'till you're safely back in your ship. Stay in the light. Find a nice, bright spot and just stand. If you understand me, look very, very scared." Everybody seemed to look at least a bit stressed, except for River who smiled at him. "No, bit more scared than that," he said, waiting for them to comply. "Okay, that'll do for now."

"Don't mind him," Eva told River. "He's... well, you know. The Doctor."

"Oh, trust me, I know," River muttered.

"You," the Doctor said, marking at one of the men. "Who are you?"

"Er, Dave," he replied.

"Okay, Dave –"

"Oh, well Other Dave," he said. "Because that's Proper Dave the pilot, he was the first Dave, so when we –"

"The way you came," the Doctor cut him off. "Does it look the same as before?"

"Yeah," Other Dave said. "Oh, it's a bit darker."

"How much darker?" the Doctor asked.

"I could see where we came through just a moment ago," Other Dave told him. "I can't now."

"Seal the door," the Doctor ordered.

"We're not looking for a way out," Lux said. "Miss Evangelista?"

"I'm Mr Lux's personal... everything," Evangelista said. "Sign these contracts agreeing that your experiences inside the Library are the intellectual property of the Felman Lux Corporation."

"Right, give it here," the Doctor said, and Evangelista handed the three of them forms to sign.

"Yeah, lovely. Thanks," Donna muttered before she and the Doctor tore their forms in sync.

"Well, that was rude," Eva muttered.

"Are you going to sign?" Evangelista asked hopefully.

"No, sorry," Eva said, handing her back the form. "But I won't tear it up."

"My family built this library," Lux said. "I have rights."

"You have a mouth that won't stop," River said, looking at the Doctor. "You think there's danger here?"

"Something came to this library and killed everything in it, killed a whole world," the Doctor told her. "Danger? Could be."

"That was a hundred years ago," River said. "The Library's been silent for a hundred years. Whatever came here is long dead."

"Bet your life?" Eva asked, smiling as she already knew what River was going to say.

"Always."

The Doctor marched forwards, grabbing Lux's torch and using it to light one of the darker areas in the room.

"Almost every species in the universe has an irrational fear of the dark," he said. "But they're wrong. Cause it's not irrational."

"It's Vashta Nerada," Eva said.

"What's Vashta Nerada?" Donna asked.

"It's what's in the dark," the Doctor replied.

"It's what's always in the dark," Eva added.

"Lights!" the Doctor called. "You got lights?"

"What for?" Lux asked.

"Form a circle," Eva said. "A safe area, big as you can, lights pointing out."

"Do as she says," River ordered.

"You're not listening to them?" Lux asked.

"Apparently, I am," River told him, before turning back to Anita. "Unpack the lights. Other Dave, make sure the door's secure, then help Anita. Mr Lux, put your helmet back on, block the visor."

"Proper Dave, find an active turmoil," Eva said. "I want you to access the library database, see what you can find about what happened here a hundred years ago. Doctor!" He looked at her. "With us."

"Professor Song," Lux said. "Why am I the only one wearing my helmet?"

"We don't fancy you," River and Eva said together.

"Don't let your shadows cross!" the Doctor said as he walked to where River and Eva said. "Seriously, don't even let them touch. Any of them could be infected."

"How can a shadow be infected?" Other Dave wondered.

Eva sat next to River, giving the Doctor a death glare when he moved to sit by her side. He sighed, sitting in front of River and examining her.

"Thanks," she told them.

"No problem, dear," Eva said.

"For what?" the Doctor asked, not following their conversation.

"The usual," River shrugged. "For coming when I call."

"That was you?" the Doctor asked.

"You're doing a good job, acting like you don't know me," River commented, causing the Doctor to exchange a worried glance with Eva. "I'd assume there's a reason if not for the fact that Evie's normal."

"There is," the Doctor said. "A fairly good one, actually."

"Okay, shall we do diaries, then?" River asked, opening her TARDIS cover diary. "Where are we this time? Going by your face, I'd say it's early days for you, yeah? So, er... Crash of the Byzantium, have we done that yet?" She looked at the Doctor's indifferent face. "Obviously ringing no bells. Right, Picnic at Asgard. Have we done Asgard yet?"

"River..." Eva said softly.

"Obviously not," River muttered. "Blimey, very early days, then. Life with a time traveller - never knew it could be such hard work." She smiled slightly before looking at the Doctor's face. "Look at you!" she said. "You're young. The both of you, so, so young."

"I'm really not, you know," the Doctor said.

"No, but you are," River told him. "Your eyes. You're younger than I've ever seen you."

"River..." Eva repeated, but the Doctor cut her off.

"You've seen me before, then?"

River froze. "Doctor," she said. "Please tell me you know who I am? Eva," she added, turning to her friend. "Please tell me this isn't..."

"Who are you?" the Doctor asked her.

Eva put a hand on River's, trying to comfort the other woman but only making her turn her head.

"Do you know me?" she asked.

"Of course I do," Eva told her. "I know all about you, River Song."

"But have we met yet?" River questioned. "Have you met me?"

Slowly, Eva shook her head. Tears shone in River's eyes as she opened her mouth to reply, only to be stopped by a beeping noise. The Doctor immediately stood up.

"Sorry," Proper Dave said. "That was me. Trying to get through into the security protocols, I seem to have set something off. What is that?" he asked. "Is that an alarm?"

"Doctor," Donna said. "Doctor, that sounds like..."

"It is," Eva said, standing up as well but not letting go of River's hand.

"It's a phone!" the Doctor said.

"I'm trying to call up the data core, but it's not responding," Proper Dave said. "Just that noise."

"But it's a phone!" Donna protested.

"Let me try something," the Doctor said, typing on the keyboard. "Okay, doesn't like that, let's try something else. Okay," he said as he managed to get it to work. Here it comes. Hello?" he asked.

A picture appeared on screen, of a young girl sitting and drawing in a living room. She raised her eyes, and looked right at them. "Hello," she replied. "Are you in my television?"

"Well, no," the Doctor said, bewildered. "I'm... I'm sort of in space. I was trying to call up the data core of a triple-grid security processor."

"Would you like to speak to my dad?" she offered.

"Your dad," the Doctor said. "Or your mum, that would be lovely."

The girl nodded, turning away before turning to look back at him. "I know you!" she said. "You were in my library."

"Your library?" the Doctor repeated.

"The Library's never been on the television before," the girl said. "What have you done?"

"Ah," the Doctor mumbled. "I... I just rerouted the interface –"

The screen shut down, leaving them all staring at the symbol of the Library again.

"What happened?" River asked. "Who was that?"

The Doctor typed some more, but all that happened is a message saying, "ACCESS DENIED," popped up.

He looked at Eva thoughtfully for a couple of moments before saying, "I need another terminal," and moving to one of the other screens.

"Keep working on those lights," Eva called out as she ran after him. "We need those lights!"

"You heard her, people," River said, following the duo. "Let there be light."

The Doctor opened the new terminal screen, trying to get it to work again. From the corner of his eye, he could see River's diary, and he almost reached out for it when Eva grabbed it, handing it to its owner.

"Sorry," she said. "You're not allowed to see inside the book, it's against the rules."

"What rules?" the Doctor asked.

"Eva's rules," River replied, grabbing her diary and walking away.

"You know, don't you?" the Doctor asked Eva, not taking his eyes off the screen. "You know who she is to me. Who she will be."

"In general," Eva said. "I know some things, but there's no way to tell how my presence here will change things."

"What do you mean?" the Doctor asked. "Evie..." he started, but she cut him off.

"Don't call me Evie," she said sharply.

"Then tell me what do you mean," the Doctor retorted.

All Eva did was smile sadly. "Spoilers," she whispered, just as a book flew away from one of the shelves, followed by another and then a third. It wasn't long before books were flying all around the room.

"What's that?" the Doctor asked. "I didn't do that," he said. "Did you do that?"

"Not me," Proper Dave said from where he was standing next to the first terminal.

The Doctor tried to enter the computer system and check what was causing it, but the system wouldn't budge. "CAL, ACCESS DENIED," showed up, and he frowned.

"What's CAL?" he called out, turning to look at Eva when nobody replied. "Eva, if you don't tell me what's going on, people might die."

Eva closed her eyes, taking a deep breath. On the one hand, if she told the Doctor what happened, she might change his future, River's past and possibly not be able to save all of the people trapped inside the Library's computer. On the other hand, if she didn't tell him... it wasn't a case of 'People might die'. People will die – five out of the nine in the room at the moment.

She opened her mouth to tell him, but was disturbed by River calling for her.

"Evie!" she said. "I need you here!"

"How come she's allowed to call you 'Evie'?" the Doctor grumbled.

"Cause she likes me better," River retorted, as Eva neared her.

"You wanted me?" she asked quietly.

"Yes," River said. "Don't listen to what the idiot tells you. That was a low-blow, and he knows it."

"But I know what's going to happen," Eva said. "I can... I can save people."

"No, you can't," River replied. "Well, sometimes, you can, but not always. Not when the change is too big."

"This is a big change," Eva said. "People are going to die."

"And how many are going to live?" River questioned. "More, I suppose."

"Yes," Eva replied. "But –"

"He had no right to ask you for answers," River said. "You're not here to magically solve every problem."

"Then what am I here for?" Eva questioned, causing River to smile brightly at her.

"Spoilers."

More books flew away from the shelves, and River looked up.

"What's causing that?" she asked.

"The little girl," Eva replied, confident that she could tell them that much.

"But who is the little girl?" the Doctor asked. "What's she got to do with this place? 'You're hurting her', that's what Eva said... How does the data core work?" he questioned. "What's the principle? What's CAL?"

"Ask Mr Lux," Eva told him, and the Doctor turned his head.

"CAL," he said. "What is it?"

"Sorry," Lux said. "You didn't sign your Personal Experience contracts..."

"Mr Lux," the Doctor said, coming to stand right in front of him. "Right now, you're in more danger than you've ever been in your whole life. And you're protecting a patent?"

"I'm protecting my family's pride," Lux said.

"Well, funny thing, Mr Lux," the Doctor said, not sounding nor looking the slightest bit amused, "I don't want to see everyone in this room dead because some idiot thinks his pride is more important."

"It's not his pride!" Eva said. "And it's not a patent, either."

"Then tell me what is it and we can all get out of here," the Doctor said.

"She can't, and you know it!" River cut in. "And you should be ashamed of yourself for even asking her."

"Okay, okay, let's start at the beginning," the Doctor said. "What happened here? On the actual day, a hundred years ago, what physically happened?"

"There was a message from the library," River said. "Just one. 'The lights are going out'. Then the computer sealed the planet and there was nothing for a hundred years."

"It's taken three generations of my family just to decode the seals and get back in," Lux said.

"Um... excuse me –" Miss Evangelista started, looking at the door that opened at the corner of the room.

"Not just now," Lux cut her off.

"There was one other thing in the last message," River started.

"That's confidential," Lux told her.

"I trust this man and woman," River told him ."With my life, with everything."

"You've only just met them," Lux protested.

"No," River replied. "They've only just met me."

"Erm..." Miss Evangelista said. "This might be important actually –"

"In a moment!" Lux told her.

"This is a data extract that came with the message," River said, showing it to the Doctor.

"4022 saved," he read out, Eva moving her lips in sync. "No survivors."

"4022," River repeated. "That's the exact number of people who were in the Library when the planet was sealed."

"But how can 4022 people have been saved if there were no survivors?" Donna questioned.

"That's what we're here to find out," River told her.

"And so far, what we haven't found," Lux said. "Are any bodies."

Silence fell on the group for a couple of seconds before Miss Evangelista's scream was heard, just as Eva knew would happen. The Doctor immediately grabbed a torch and ran towards the source of the sound, River following him with Eva's hand clasped in hers and the rest following not far behind. They walked into the study room of the Library to find a skeleton wrapped in a torn spacesuit.

"Everybody, careful," the Doctor said. "Stay in the light."

"So you keep saying," Proper Dave said. "I don't see the point!"

"Who screamed?" the Doctor asked.

"Miss Evangelista," Eva whispered, the tears welling in her eyes.

"Where is she?"

"Miss Evangelista, please state your current..." River stopped as she heard an eco of the words she was saying. "Please state your current position..." she said, nearing the suit and taking Miss Evangelista's com out. "It's her," she whispered. "It's Miss Evangelista."

"We heard her scream a few seconds ago," Anita said. "What could do that to a person in a few seconds?"

"It took less than a few seconds," Eva told her, turning around and leaving the room with the knowledge that Miss Evangelista's death was on her.

A/N: And so Eva needs to face the first time someone dies and she can't save them...

Until next time, you can look for me on Tumblr (mayalr96, Fandoms All Day) for sneakpeeks and updates, or on pa tr eon (Delete the spaces on the site name, ffnet is annoying. username: Mayalr96).