The 1989 murder of a young mother is reopened when the woman's teenage son, who witnessed the crime when he was 3 years old, is brought in for petty theft and starts talking. The investigation reveals that the boy's slain mom may not have been who she claimed to be.

As the first season ends, Lilly reopens a 1986 case in which a 15-year-old girl was killed at a popular lovers lane: DNA evidence has revealed that an innocent man was convicted of the crime. The new investigation turns the spotlight on several men who were attracted to the teen and may have had motive to kill her.