Reese and Finch question the machine's reliability when it prompts the investigation of a teenager who was killed years earlier; Finch recalls the origin of the machine.
As Alicia defends a husband accused of murdering the babysitter, she and her family prepare for the outcome of Peter's appeal and his possible coming home.
When anthrax kills a pickpocket, Holmes and Watson must track the toxin's source before anyone else is put in danger.
When a legal aid striker is killed outside the courthouse, the sand in his wounds leads detectives to investigate a greensman; due to the strike and shortage of defense attorneys, Rubirosa and Cutter must face each other in court.
When a magazine publisher is murdered, a wide array of suspects surfaces.