Plot line: [Half-alien main character] is kidnapped as a small child. This story is basically their story of growing up in captivity. They are tested on by staff at the facility, and left to sleep and eat in uncomfortable situations. They barely know what the outside world is like. Then, they find a sweet janitor who tells them about their parents, and then offers to help them escape. Little do they know she's actually a spy for a different facility, who also wants to test on the half-alien child. They are kept there for a while, until the government (or the other facility, your choice) raids the one [main character] is currently in, killing everyone who works there and then finally killing them. 

Characters: [Half-alien main character (any gender)], [Female, sweet, janitor], [Possibly an evil overlord who controls one of the bases?]