Ann Cusack

Rita: "Get in."
Kate Beckett: "No. No. Not until you tell me who you are."
Rita: "You can call me Rita. I'm Castle's stepmother."

Rita: "I've been married to Castle's father for almost ten years."
Kate: "Jackson never mentioned being married."
Rita: "Well, of course not. It's classified. In this line of work, you make a lot of enemies. Attachments are liabilities, leverage to be used against us."
Vikram: "Sounds romantic."
Rita: "It can be. Absence doesn't always make the heart grow fonder, but it sure does wonders for the libido."

Rita: "William Bracken was just killed in prison. This changes things. I'm afraid the only way that you and Vikram are gonna be able to stay alive is if you go on the run. And one day, I hope I will be able to root out the big bad and get the target taken off your backs."
Kate: "'One day'?"
Rita: "Yes, dear. I'm afraid the life that you were living yesterday is over."

Kate: "Friends of mine were killed because of me."
Rita: "Their deaths weren't your fault, Kate. Surely you must see that."
Kate: "Still, I got to do something. And you know, maybe in doing it, that'll give me peace and I'll be able to move on."
Rita: "Do you love Castle?"
Kate: "Yeah."
Rita: "Then why do you want to get him killed? Have you forgotten why I never see my husband? Attachments are liabilities, leverage to be used against us by our enemies."
Kate: "So I have to choose between finding the killer and being with Rick? That's ridiculous."
Rita: "That's the job. Five people were killed because of a redacted memo. What do you think is gonna happen if LokSat finds out that you and Castle are working together on this? You're a big girl. Dive down the rabbit hole if you must, but think twice about who you bring with you, because unlike McCord and her team, anybody who dies now, that blood is on you."