It's Hood Day on the streets of Los Angeles, and Captain Rucker (guest star Carl Lumbly) has the department playing hall monitors. Sammy lets old grudges die hard when he leaves a gang territory unattended, only to have a violent gang war erupt throughout the city. Ben's recent mistake continues to haunt him publicly everywhere he goes. Ruben (guest star Dorian Missick) practices his speech for his daughter's quinceañera in the midst of a murder investigation. Cooper and Tang investigate a robbery in a strict Orthodox Jewish home, leading Tang to reveal parts of her past.