20/20 on ID

A young woman is found dead in a friend's apartment, but the friend is nowhere to be found; as police hunt him down, they discover a deadly plot, in which one person is a mastermind, while the others are mere actors in his play.

Even though there's no body and no murder weapon, police believe a missing woman is dead at the hands of her husband; prosecutors take him to court four times, trying to unravel the truth about his wife's haunting disappearance.

A mother of three goes missing; her car is found in flames, but she is nowhere in sight; as police begin to investigate, they find out she has been keeping a secret from her family.

A man is convicted of murdering a young woman and leaving her body on a riverbank in North Carolina; a crusading attorney is convinced he's the victim of an overzealous investigation and sets out to prove his innocence and free him from prison.

After a small-town girl disappears, police have a suspect, but it's her brother who lays the trap to catch her killer; a college professor wonders if it was his classroom where the murderer learned how to cover up the crime.

Kim Long says she came home late one night to find her boyfriend bludgeoned to death, but a jury finds her guilty of murder; then, a new attorney takes a second look at the evidence and seeks to set her free.

A shot rings out as a New Year's Eve party comes to an end, and Ashley Fallis lies dead in her bedroom; initially ruled a suicide, Fallis' husband is later accused of murder.

A young man and his mother go on a fishing trip, but only he returns; questions surface about whether the victim's presumed death is the result of a boating accident or murder; additionally, there is another suspicious murder in the family's past.