S1, E10: When a family employs Walter to find their missing father and husband, the only help they can offer is a partial voicemail recording of his last message to them. Meanwhile, an attractive FBI agent (guest star Kelly Carlson) is also looking for the same man, and she tries to get as much information about him from Walter as she can. Also, Leo’s memories of his deceased wife and daughter bring new meaning to the case and the family they’re trying to reunite.