You were apart of the BAU as a teenager somehow being smart and strong enough to pass all the tests and be the youngest agent and you were in it for over two years. However one day you were on a mission and you died saving a baby in a split decision. Now only three years later you have somehow appeared and become visible to the human eye after being knocked out and not aware of anything. You find the team trying to solve a case that you already know who the unsub is and where the victim is because of when you where a ghost. Now you can’t decide if you should go over and help because that would cause more distress or lay low for a while. You were really close with Gideon as he treated you kind of like his kid during cases and you saw him as a father figure even though you were close with the whole team. But first you are at the moment when you are climbing the sign.