The moment his mental probe touched her presence, Luke sensed the slick, oily feeling of the Dark Side brush against his mind, and recoiled. That sensation--one too familiar to him, all too familiar--could only mean one thing. This Vestara Khai, this girl who said she was going to be working with him in his future, was the source of the shadow that had been growing in his mind since the latest group of arrivals. And that meant she was a Sith.

A Sith? But she's only a girl! She can't be older than Ben.

"I find that hard to believe," he said, a little more cautious now. Luke hadn't sensed a lie when she said they'd work together, but she was a Sith.