Ty, Sully, Bosco, and Faith rush to the scene of a school shooting; Sully and Tatiana ponder their future together; Kim continues to struggle with her depression.
A skinny 14-year-old boy, sick of getting picked on at school, steals his father's gun and goes on a shooting spree at his school. The cops, paramedics, and even firemen, of the 55 spend most of their shift dealing with the fall-out. Faith, mother of two more