Episode 20: The Mississippi River

Gil finds a third miniature crime-scene replica at a murder site, and CSI tries to find a link between the three otherwise-unrelated murders.

Six showgirls who live together are murdered in their home. Sara is distressed when the final victim dies in her arms but she leaves a vital clue that could help Sara identify the killer.

The team searches for a link between a current string of murders in Las Vegas and a notorious mob boss who disappeared in the 1970s.

A death in a drive-by limo shooting and the dragging death of a young woman turn out to be related crimes. Greg discovers that the brother of the young man he ran over may have been involved.

Keppler proposes that Catherine create a phony crime scene to help catch a murderer and to keep it secret from the other investigators. However, Nick quickly figures out that something is fishy.

Grissom thinks the miniature killer is dead, until he receives another miniature crime scene. However, unlike the others, this one predicts a crime scene that hasn't happened yet.

While the team is struggling to adjust to Michael, the new team leader, the CSIs investigate the murder of a girl who may be the victim of a serial killer who has been killing since the 1970s.

The CSIs investigate the murder of a woman who is a part of a UFO club that believes aliens have mated with humans for several generations in order to conquer the world.

The team gets closer and closer to identifying the miniature killer, but when Sara goes missing, Grissom must expose their relationship to the team in order to save her life.

After an unsuccessful attempt on Lady Heather's life, Sara discovers Gil's prior relationship with her. Meanwhile, Nick investigates the death of a woman apparently hit by a taxicab.

With Grissom out of his office and all of the detectives out in the field, Hodges and the other lab techs try to discover new clues in the miniature killer case.

A washed-up boxer is found beaten to death at a bordello. The medical examiner is having a hard time figuring out which blow was the cause of death.