Alina Marinescu is an agent with Elite.
More specifically, Marinescu is an assassin. Plain and simple, her job is to kill people and she is very, very good at it.
Elite is described as "Elite Counter-terrorism Covert Ops, a secretive organization that doesn’t exist, run by people who don’t exist. An organisation without label or official title, not registered anywhere under secret codes, not affiliated to any intelligence or security services. Elite exists beyond existence itself, not constrained by law or scrutiny from the media."
Also mentioned early on is the fact that "she doesn’t know how many assassins Elite operates, but she knows she is unique among them. She had been trained for more, taught to infiltrate, seduce, eavesdrop, steal, kill. She’d learned how to withstand pain and how to inflict it."
Marinescu did not choose to become an assassin. She did not elect to go to work for Elite. She was seduced into it by a man named Alex, a guy who was given her as his assignment to woo and win over and then to turn slowly at first and then quickly thereafter into the agent she is now. Before she met this man she was a decent human being with no desire to hurt anyone. With his tutelage, that will, unfortunately for her, change over time. Along the way she would come to love him and then despise him and the same might be said for Alex.
Though her life will change a great deal over the many years of her service with Elite, she will remain an incredibly dangerous weapon. Sometimes it is not much of a life to her but it will always be a lot more than her targets have after her visit.
--"Erase any trace, become invisible, live in the shadows. You don’t exist. You are a ghost…"