Cassandra's a Ghost. (Spy Ghost, not spooky ghost).
Her parents are spies. To save her from one of their enemies, they gave her to the Ghost Agent Initiative. Thus, the government became her mother, father, and guardian.
Now, it's ready to be her teacher as well.
Cassandra is happy to learn the survival skills, but she's less thrilled with the idea of becoming a killer.
Season 1: When a routine training mission goes awry, Cassandra's sent into the program's capstone course for safekeeping. The program director has different plans.
Season 2: Several training missions stretch Cassandra's body, mind, and morals. The director's plans go very wrong, and his only way out is to place the blame on her.
Dead people tell no tales.