Richard Castle said this quote

“ It pained her that a few hundred words in an also-ran newspaper could get her kicked out. That damned article.And Rook.Her sharpest agony. She had invested in this guy. Waited for this guy. Felt something for this guy that went beyond the bedroom ... or wherever else they took each other. Nikki did not give herself easily to a man, and this betrayal by Rook was why. Heat reflected on her answer at the oral boards about her greatest flaw and admitted her reply was a mask. Yes, her identification with her job was total. But her greatest flaw wasn’t overinvestment in her career. It was her reticence to be vulnerable. Unarmed as she was-literally-she had been emotionally so with Rook.That was the gut shot that had blown clean through her soul. ”