A 25-year-old woman is murdered and a chief inspector commands 80 detectives and civilian staff to investigate in one of England's largest police investigations, and an anonymous tip from a female caller helps locate the killer.
A high school student is killed after a heated argument with her boyfriend, but the case goes cold for 18 years until legislators pass a law requiring felons to provide DNA samples, which results in investigators zeroing in on suspect.
A woman's partially clothed body is discovered in her boyfriend's apartment, and authorities are led on a complicated and violent chase to catch the killer, with suspicions falling on a friend of the couple's.
A Wendy's restaurant is hit by a pair of robbers and things escalate into a shooting that leaves two people dead, and investigators unearth a tale of revenge and betrayal after one survivor reveals to police what he witnessed.
A Navy doctor and his wife are attack in their San Diego home, resulting in the doctor's death and leaving wife fighting for her life, and detectives unearth a series of secrets; jealousy; adultery; and murder.