Graham Waters is an African American detective for the LAPD. He is in an interracial relationship with his Latina partner, Ria. He is quite racist towards her and obviously very insecure about their relatiobship.
Graham tries to distance himself from his mother and his criminal younger brother. However, after his brother goes missing, he is forced to deal with them.
It's the sense of touch. In any real city, you walk, you know? You brush past people, people bump into you. In L.A., nobody touches you. We're always behind this metal and glass. I think we miss that touch so much, that we crash into each other, just so we can feel something.