Ben winds up in a patrol unit alone for the first time. Among the cases he has to handle on his own are a missing girl and a suspected stalking case. Lydia and Rene spend the day checking in on and helping out Brianna and her baby. Over in Gangs, Gil Puente leads the task force to take down ex-banger Trinny Day, but Sal and Sammy have a hard time working with Puente. While patrolling with John, it is clear that Chickie has no command presence, but she is determined to work harder and become a good cop again.