It's been several years since the catastrophe in Aperture Labratories, and Chell is quite enjoying life outside the nightmare facility. No tests, no psychotic A.I. telling her what to do (or attempting to end her life, for that matter)... Man, everything was going great.
The former test subject had scored herself a job at a space station, doing odd jobs such as cleaning and serving refreshments to the other employees. Though it wasn't her dream job, it was a hell of a lot better than Aperture, and she enjoyed the company of friendly people for once.
Until she begins to notice the disappearances. People all around her were slowly beginning to go missing, and all of the clues point back to a very specific location on the map - one that others may not have found suspicious, but to Chell, it was her worst nightmare.
After years of a peaceful life, the poor girl is forced back into the mess that she once tried so hard to forget, in order to save the new people that she's come to love from falling victim to the torture she had been put through.
... And the only help she has comes in the form of an idiotic blue core, who, after the last incident, is definitely less than trustworthy. Why couldn't he have stayed in space?
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Rated PG-14 for violence, gore, and course language. Reader discretion is advised.