Castle once said he wanted to be invisible so that he could find out what Beckett's father really thinks of him. In this episode insert for 7 x 06, he gets his chance.

When Castle witnesses Beckett's breakdown after she shoots her mother's killer, he is determined to take care of her. Episode insert for Sucker Punch.

Castle and Beckett have the opportunity to finish their conversation from 6x04, as Pi, Martha and Alexis are nowhere to be found. It may have started out as an argument, but it ended up as so much more.