TV Article 'Castle': Lisa Edelstein books multi-episode arc By Hillary Busis Published on July 10, 2013 09:44PM EDT Photo: Jason LaVeris/FilmMagic Somebody’s trading up. Ex-House inhabitant Lisa Edelstein is moving on to bigger and better digs — specifically, ABC’s Castle. EW has confirmed that Edelstein has booked a multi-episode arc on the crime drama’s sixth season. TVLine first reported the news. Edelstein — who last appeared over the past TV season on Scandal, House of Lies, and Elementary — will play hard-core federal investigator Rachel McCord. It’s safe to say that the new character will have ties to Beckett (Stana Katic), who was planning to move to D.C. in May’s finale — until Castle (Nathan Fillion) unexpectedly proposed.