Untraceable {currently on hold}

spy spī/
verb (used without object), spied, spy·ing.
to work for a government or other organization by secretly collecting information about enemies or competitors.

Jaq Connors is a 17-year old criminal who never has been caught. But the time she does, a mysterious boarding school known as L.I.S.A. picks up on her and tries to use her for a top secret project to take down the illegal acts of two countries. She works with eight other students, with talents like hers, as they go undercover and try to bring order back to the world, with no one suspecting a thing.

In other words, they must be untraceable.