Mystery of a Lifeline

Warning: this is Lifeline game fanfiction, and it may not be fully canonical to Lifeline Timeline. It mostly consists of my own ideas. Also, you don't have to play Lifeline to read this, BUT I highly recommend playing it for better understanding.

The aliens are already on Earth. Infiltrating, occupying, hiding. Most of the world population is oblivious to this fact- just like Emma Blackwood was once. But after hearing weird stories from her uncle, she began rethinking all that she knew about space and Earth before. After her childhood friend- with whom she lost connection long time ago- is chosen to accompany the crew on the first mission of a new spacecraft which soon crashes on a distant moon, she decides to take an action, building a communicator to get in touch with him again. After that, she is thrown into a mysterious and hidden world. Someone else contacts her, in need for help- and it continues. Why do they contact her of all people? Is it possible to stop the aliens? She has been trying to answer these questions since the day she saw the truth. In search of help, she finds an organization that fights against the aliens secretly. Working here, she begins discovering something completely new to her...