The team think that two people might be working together to commit a series of murders, taking leads from DVD footage of each crime provided by the families of the victims.
Sarah and Michael head to Miami; Christina tells Lincoln about her plans to take over the company; Self and T-Bag's hunt for Scylla leads to a surprising discovery.
After a father is gunned down on the freeway, Don and his team must determine if it was a random act or the work of a serial killer.
Lilly and the homicide team reopen a case from 1988 involving four high school friends. The friends went their separate ways after graduating in 1980, until one of them turned up dead eight years later.
Sipowicz and suspended Simone try to clear their names in the Salvo murder with Kirkendall's inside information from an unlikely source.