0

Dan's ex-fiancée who went missing and was eventually presumed dead almost ten years before the start of the series. When Dan encounters her in the past, she reveals that she travels through time in the same way that he does, and has begun following Dan's travels much as Dan himself follows the lives of people he meets in the past. She has only appeared to him in the past, and acts as a mentor, giving advice on his interventions in other times. Her "home" time is sometime after her disappearance from Dan's life, but she has not revealed what caused it.

(wikipedia.org)