Nick Barron decides to return to work after being involved in a deadly shooting; Ben's transfer to Station 19 triggers an internal investigation.

When a showdown between rival street gangs goes wrong, Ben's life is put in danger; Isabelle believes Nick may have feelings for someone else.

Ben and Nick are left to deal with a group of aggressive citizens before tending to a dangerous domestic disturbance.

Nick causes a stir within the group as he brings Harvey to Houle's barbecue. Plus, a botched take-down has Ben questioning Tyler.

Nick and J.M. are assigned to go out on patrol together for the first time. Plus, Beatrice is thrilled when she finds a new romance.

Ben and Nick are continued to be haunted by a cover-up from their past. Plus, Ben invades Nick's personal life.