[Beckett, Ryan, and Esposito are at dead ends in their respective cases]
Beckett: We'll start over. Fresh eyes. You take our murder, we'll take yours.
Esposito: All right.
Castle: [a thought strikes him] Whoa, whoa, whoa, whoa. Say that again.
Beckett: You take our murder, we'll take yours.
Castle: Could it be that easy? You take mine, I'll take yours.
Esposito: What are you getting at, Castle?
Castle: Strangers on a Train.
Ryan: The Hitchcock movie?
Castle: I'm partial to the novel by Patricia Highsmith, but yes. We have two strong suspects, but with airtight alibis, right?
Esposito: Right.
Castle: We know they're connected. What if the connection is the killers?
Beckett: Jason and Eric committed each other's murders.
Castle: And made sure they had an airtight alibi for the murder they knew they'd be suspected of. It's not our victims that are connected, it's our murderers. Crisscross!

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