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Tonight on CASTLE, the brand new episode "The Greater Good", we are going get to know Captain Gates and her complicated family dynamics a little bit more. From watching the promo and sneak peeks, fans have only got a glimpse of Gates' reaction when her sister, U.S. Attorney Elizabeth Weston, enters the precinct in order to solve the homicide case of the Wall Street trader who happens to be an informant for the U.S Attorney's office. 

What can we expect in "The Greater Good" that will later be revealed?

Penny Johnson Jerald: You're not the only one who is excited. I have been waiting for this since day one. Every time I learn a little bit more about Gates, it makes me even more ecstatic as a fan of the show as well. "I am going to have a sister. How about that?"

What have we learned so far about Captain Gates?

Captain Victoria "Iron" Gates was the youngest female cop in the internal affairs. She loves cops, Her father and uncles were cops. She is married. She sometimes despises Castle and his theories, which sometimes help solves cases.