Kate Beckett:  This was supposed to be over . I ca n't go back again . Not now .
Richard Castle: Well , now we do n't have a choice . If Maddox gets to him before we do ...
Kate Beckett: But I do n't know how to do this . I 'm not even a cop anymore .
Richard Castle: I 'll tell you exactly what we do .
Richard Castle: We
Richard Castle: figure out who this is . We 've done it before , and with less to go on . And when we do , we lay all of this to rest and we go back to where we were . This is what you 're great at . And I 'm not so bad myself . So , what do we know ? We know this guy is about 60 . He 's a longtime New Yorker , uh ... friends with Montgomery , so he may have connections to law enforcement .
Kate Beckett: He , um ... he seems prominent . Wealthy .
Richard Castle: That 's right . And he has been that way ever since this photo was taken .
Kate Beckett: How do you know that ?
Richard Castle: Look at his wrist . That 's a Nautilus 3800 . It was $ 10000 when it came out in 1981 .
Richard Castle: That
Richard Castle: 's the year Montgomery was married . May of _ 1981 _ . How many of these watches could possibly have been sold in five months ?