When Emily Miller buys flowers, she never expects to be killed by a bullet. It's not long before Det. Mac Taylor (Gary Sinise) uses Dr. Sheldon Hawkes (Hill Harper) and Det. Don Flack (Eddie Cahill) to help find a solution. A tooth tells Hawkes there might be another victim. Two seconds later, this is confirmed.
Det. Jessica Angell (Emanuelle Vaugier, Two and a Half Men) is already on scene when they arrive. She tells them deceased number two is Judge Julio Riverton (Roy Werner, Power Rangers Time Force, Renegade). Unfortunately, Madison ( Ashlee Gillespie, 7th Heaven), his daughter, was the one to discover his body. After she and the two young men with her, Charlie and Jake, are questioned, lab results help them pinpoint the killer.
Dr. Sid Hammerback (Robert Joy) gives Mac and Det. Stella Bonasera (Melina Kanakaredes) a strange cause of death. The judge was bludgeoned instead of simply being shot. This is odd, since a bullet would have been faster.
An arrest is made. Jake beat the judge while Charlie watched. The act was in retaliation for being in the foster care system when they were younger. Mac reminds them their impulsive act left two dead, a woman without a parent, and no future for either of them.
Meanwhile, Det. Danny Messer (Carmine Giovinazzo) raises an alarm for Det. Lindsay Monroe (Anna Belknap) when he doesn't show for work. She covers with Mac, but gets Flack to find out what the story is.
Once the super at Danny's apartment building lets Flack in, a quick look around sheds light on things. It doesn't take much to figure out that the death of his young neighbor, Ruben, has been affecting Danny's work. However, Flack eventually finds his friend. What Danny tells him is chilling.