CASTLE - "Valkyrie" - Last season ended with Beckett wrestling over whether to take a high-profile job in DC -- a dilemma made more complicated when Castle proposed to her. In the Season 6 Premiere of "Castle," Castle and Beckett will deal with the consequences of their decisions against the backdrop of a high-stakes investigation, MONDAY, SEPTEMBER 23 (10:01-11:00 p.m., ET) on the ABC Television Network. Lisa Edelstein ("House") guest stars in a three-episode arc as a tough and highly-skilled Federal investigator whose appearance plays a vital role in Beckett's decision about her future. (ABC/Richard Foreman) JOCKO SIMS
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