Welcome to MIRA!
MIRA is a space transportation company that specializes in spaceships, airships, and mini space colonies. Being the main spacefaring organization of Earth, they do everything from deliveries to construction to analytical research trips. Everything is ran from the atmospheric-tall skyscraper HQ. Communications, repairs, research, and training are held at HQ, and people are sent off to new missions from it.
Being a for-profit company that ends up hiring many...disposable workers, the research end is what gets them in the most trouble. That is, workers and the company tend to get in over their heads. Researching energy crystals is one thing, but when you accidentally drag in more than you can handle... That's where the imposters cause trouble.
The imposters are an alien race of unknown origin. They can steal people's bodies, temporarily shapeshift into different forms, or turn invisible for short periods of time, depending on the type. MIRA is trying to keep them from causing trouble on the rest of Earth by keeping the issue contained to their ships, colonies, and top levels of their HQ. Of course, letting some random workers get murdered in a ship with them isn't as much of a problem, so they let that keep happening. It's unavoidable, you see.
While MIRA is trying to do analytic work on the imposters to see how they work and what can be done against them, it's slow work. They're hard to get ahold of in their natural form since they're always changing it or infecting others. They're smarter than they look and are naturally immune to a lot of things, though throwing them into space, lava, or lighting them on fire works well enough. That is the other problem though, naturally when workers find someone they think is an imposter, they completely get rid of that person in any way possible. It's hard to study the remains of a splatter of a body that got thrown off a massive airship, and such.
