This look shows Beckett’s pure and whole-hearted fear. The fear that she has lost the one person on this planet that could brighten her days just with his presence. The fear of never being able to tell him the way she truly feels. The fear of never getting to thank him for everything he has done for her over the years. The fear of him never being able to fulfill his promise of being her always. This is the moment that Beckett realised just how much she cared, even loved, her friend, her partner, her favourite author, her 9 year old on a sugar rush, Richard Castle.