In one of our all-time favorite Castle scenes from Season 3, Episode 22: "To Love and Die in L.A.," Beckett reads a note from Mike Royce, her former partner and training officer. He tells her not to put the job ahead of her heart. "Risking out hearts is why we're alive," the note reads. "The last thing you want is to look back on your life and wonder ... if only."
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