In Louisville, a community is outraged when a married couple is gunned down at home in front of their two young children. Det. Kevin Trees and the homicide team hit the streets hoping the community's strong reaction to the killing will trump the neighborhood's long-standing code of silence.

In Harris County, Sgt. Roger Wedgeworth investigates the gruesome murder of a homeless man found stabbed to death along Interstate 45. Without any witnesses or a motive, investigators race to find a suspect before the case goes cold.