In Gwinnett County, a beloved rapper is gunned down in a hail of bullets from a drive-by shooting. With little hard evidence, detectives and prosecutors need to rely on a tipster to testify--despite the risks--and bring the suspect to justice.

Detectives and attorneys struggle to understand a man's mental state in the wake of a shooting that killed four people in broad daylight, and the entire case rests on the man's sanity and the reaction of the victims' families.