That's my first SnK fanfic which isn't a one-shot. That's why I feel a bit nervous... Once again I warn you English isn't my mother tongue, so be ready for errors :)

Prologue

Walls' Whisper

The enormous, majestic Wall looked against the background of the sky covered by heavy dark clouds even more sinister than usual. Hanji had always wondered how this monumental construction could have come into existence over two thousand years ago. But that was only one of many riddles she couldn't solve. That was exactly the reason why she decided to become a scientist. Her permanent hunger for knowledge made her want to spend her life looking for answers for countless questions. Being on second year of PhD studies in biochemistry and genetics she had a possibility to take part in many various projects. She approached each topic with equal enthusiasm. She devoted all her time and energy to design new drugs, analyze new unknown proteins and organisms, dispel doubts about the latest achievements of science. Anyway she did it till the day she saw the Wall for the first time.

Maria, Rose, Shina. That was how three ancient buildings were called. A secret of which couldn't be revealed even by the greatest minds of science. No one knew how and, most of all, why those three, hundreds of kilometers long, walls in vicinity of Shiganshina, Stohess, Utopia and Mitras, were created. What's interesting, in spite of passing of 2000 years Walls were almost intact. The only exceptions were irregular interruptions in their continuous structure allowing the authorities to build a road network without interference of the Institute of Antiquities and Heritage. Of course, archeologists couldn't explain why in constructions, which could last such a long time without any damage, such long gaps appeared. Even a material from which Walls were made of was impossible to determine, because it didn't resemble any known substance. When Hanji Zoe arrived in Shiganshina in order to visit her friend from college, she couldn't resist and took a few samples, not caring about Ilse's warnings that for such an act without proper authorization she may face huge fines. In such a way a new obsession was born. Hanji devoted all her free time to study obtained samples. First analysis' were fruitless, but by no means it influenced enthusiasm of future PhD. The brown-haired woman had experienced such a fascination for the first time. Something in her subconscious told her to continue what she started. No matter what she couldn't stop.

After a mouth of fruitless studies her effort was awarded and results she obtained exceeded her expectations. From the very beginning she analyzed probes for inorganic substances and every single time she couldn't find anything. One day she decided to do something completely pointless: she set the program used for analysis of fossils. It was totally illogical. Walls were just old buildings not a environment of life of any organism. This analysis should have yield the same results as the previous ones.

But the opposite happened.

According to the scanner the main ingredient of Walls were living cells. With DNA profile astonishingly similar to the human genetic code.

Hanji didn't believe in what the monitor displayed. It had to be some error. She had to revisit Shiganshina and take some new samples. Without much thinking she booked a plane ticket and the following day she looked at the Wall called Maria. Just like the first time this view made her feel many contradictory emotions. Excitement. Curiosity. Hunger for knowledge. It was completely normal, but why was she overwhelmed by such melancholy and sadness? She couldn't explain why this building left such a strong impression on her. But she knew she wouldn't rest till she found an answer for this question. A gust of wind raked her brown hair tied in a messy ponytail, when she heard a silent growl of the dark sky. This sound pulled her out of her reverie. If she wanted to obtain a new material for her studies before the storm she had to hurry. She opened her bag and started to look for disposable protective gloves.

'So you've come back after all.' She heard a grumpy male voice.

The surprised woman froze and turned around. Her gaze fell on a short man with a surly expression. Although the newcomer seemed to be in her age, bags under his stell-blue eyes made him look older than her. Dark jacket and jeans covered heavily muscled body, which in combination with a dangerous aura surrounding the man made normal people feel fear in contact with this person. Hanji could be described with many terms, but normalcy was never one of them.

'What do you mean?' In her voice could be heard only an astonishment.

'You shouldn't have approached this shit.' He said in serious tone ignoring her earlier question. She didn't have to ask what in his opinion deserved to be called a "shit", because his gaze was fixed on the Wall. 'It's pathetic that people behave like some fucking moths approaching of their own accord the source of their own doom.'

'Well… One theory says that moths have developed an evolutionary navigation mechanism based on light. Indeed, many of them end up in the fire, but it is not true for all moths, so it's probably too vague statement.' She responded merrily.

When the man looked at her, Hanji had an impression, that she saw in his eyes a ghost of smile besides an irritation. But it lasted so short that young woman wasn't sure if she was seeing things.

'You'll never change, Four Eyes.' He spoke so silently, the woman heard him with difficulties.

'Do we know each other?' She asked a little confused.

Before the dark-haired man could say anything, the sky thundered again. Heavy, puffy clouds began to shed the first drops of rain. The storm was getting closer.

'If you reached this place, there is no turning back.' Although he spoke quietly, his every word was perfectly audible. 'The next time we meet, everything should already be clear to you. See you.' He added and before Hanji could react, the man disappear from her vision.

'Wait! What are you talking about?!' She called after him, but all she could hear was the pouring of the rain.

When several hours later she pondered this strange meeting laying in bed in guest room of Ilse Langar, she felt completely confused. What did this man mean by saying that there was no turning back? That the next time they meet everything should be clear? How could she find out anything if she didn't get from him any answers? Tired of these questions she closed her eyes and allowed her mind to be swept away by a wave of sleepiness. That night she was accompanied by nightmares so realistic as if they weren't a creation of her imagination but processed images of some real memories. However, when she opened her eyes in the morning, she couldn't remember any of her dreams. In her mind stayed only one word, one single name.

Levi.