Cooper tries to save a suicidal teen in a situation that hits close to home, while Jessica gets a visit from someone in her past.
Officer Cooper gets a new partner -- Jessica Tang; and Lydia has a new partner as well -- Ruben Robinson,
Tang and Cooper are attacked on the street, while Lydia and Ruben question the unassuming grandmother of a murder suspect. The force gets a new captain.
Bearing a grudge, Sammy leaves a gang territory unattended, only to have a violent gang war erupt throughout the city.
Jessica tries to help a homeless vet get an ID so he can be admitted to the homeless shelter. Sammy's determined to save a dog after he accidentally shot it in the leg.
Sammy tries to make amends after the murder of a young man who agreed to testify in one of his cases. John and Jessica find themselves babysitting a documentary film crew.
Jessica's day goes from bad to worse in a shootout. Sammy holds a grudge against Ben for not backing him up during an arrest.
While Tang gets an update about the boy she shot, John wants her to come clean about what really happened. Ben tries to intervene in the life of a prostitute, but makes things worse.
Ben heads down a slippery slope as he attempts to help the daughter of a prostitute. Tang faces more questions about shooting an innocent bystander -- which could affect her future.
Tang prepares to move on to a new precinct, but first she wants to tie up some loose ends on the beat. Lydia is pressured to make a decision about her future.
