Quantico: Let's Get to the Bottom of This New Deadly Mystery

Much like Sebastian, we haven't seen a lot of this person (or any of her, really), but there are a lot of pictures of her in upcoming episodes. What's her deal? The actress who plays her, Heléne Yorke, isn't even listed as a character on the show yet, so we don't know her name or how she's involved. We do know that she could be public enemy number one.