So this is based in the AU in which the novel The Host by Stephenie Meyer, as I saw a lot of Mel in Eponine. However, it will not follow the exact same plot line as I have planned some detours of my own. This is the prologue, so enjoy!

Prologue

Enjolras had been gone for over two hours, and Eponine was worried. It wasn't like him to just disappear for hours on end without any sort of warning, and he definitely hadn't given a warning when he left almost three hours ago. The fear she had in her heart was growing rapidly but she had to keep a lid on it and look calm for Gavroche's sake. The last thing she needed was a panicking twelve year old on her hands. She knew how much Gav had come to admire Enjolras and she didn't blame him. Enj had become someone she cared for greatly, almost on a par with her siblings. Even the one she had lost. But she didn't think about that anymore.
Gavroche crawled over to her half asleep and nestled his head into her arm.
"When's Enj coming back?" he asked groggily, looking up at her with sleep filled eyes. She smiled softly, her heart filling with both love for the young boy and worry for the elder.
"Soon sweetie, he probably just hasn't found any food that's easy to steal yet. We have to remember he was a rich kid growing up," she lied, making Gavroche snort with her end comment. Her reply seemed good enough for Gavroche who muttered "Too true" before laying his head back on her shoulder, falling asleep once more. As Gavroche began to lose conciousness, Eponine looked around at her surroundings of the old closed down hotel. The building they were crashing in for the night brought back memories of her childhood, a time when her family were happy. A time Gavroche had never known as they were before he had been born. She smiled slightly at the memory of her and her sister splashing around in the lake at the back of the inn they owned, the sun shining on them, tanning their skin. It had been a better time, that was for sure.
A sudden bang brought her out of her memories, back into the dark abandoned building that had triggered them in the first place that surrounded her. Laying Gavroche down on the floor gently, she slowly began to crawl forwards to where the bang had come from.
"Enj?" she whispered hesitantly. Silence answered. Another bang came and she scrambled back, suddenly afraid, her instincts that had been in training since she was 8 kicking in. She shook Gavroche, needing him to wake up immediately.
"Gavroche! Gavroche! Wake up!" The panic in her hushed voice was evident and Gavroche was awake in seconds.
"Yeah?" he replied, but Eponine's hand was over his mouth before he could finish the word.

Please just be Enj, she thought. Please just be Enj.

She could tell her prayers wouldn't be answered the minute torch lights flooded the hotel floor that her and Gavroche were staying on. Swearing silently, Eponine grabbed her little brother's hand and dragged him to a desk in the corner of the room, mostly hidden in darkness. The panic and fear was evident in his eyes even though he tried to portray strength and bravery in his face. The scene was so familiar she thought, except so different. Eponine pulled him into a tight hug before grabbing his shoulders and looking him dead in the eye.
"Stay here," she whispered sternly. "Stay right here, I'll lead them away and then come straight back, okay?" The fear and sadness in his eyes showed it wasn't okay.
"That's what 'Zelma said," he began, his voice breaking. "That's what she said before-" Eponine cut him off with a hug.
"I promise I'll be back," she said, before shoving him under the desk out of view and grabbing the torch, running off into the darkness, making sure her footsteps echoed.
He sat there for fifteen minutes watching every patch of darkness he could, desperate to see Eponine's face again. He could hear yells, her screams, and then suddenly nothing. He waited for a moment but nothing came. And then it did. A sound he never wanted, nor even considered hearing. A bone cracking crunch as a body fell down a huge height, hitting the hard ground below. A fall he knew she wouldn't have survived. And so he silently began to sob in his dark corner on his own. He had just lost the last of his family to them, and now he was completely alone.