The CSI team have to delve into a girl's obsessive love affair to solve the senseless murder of a patrolman.
When a young woman is killed at a party for cruise passengers, the CSI team has to work fast before the murderer escapes on one of the ships.
Ivan Sarnoff breaks out of jail and goes on the run. Elsewhere, Horatio fights to save Yelina and Delko puts his life in danger.
The team probes a shooting at a hospital. The investigation puts the CSIs in the middle of a murder case involving the leader of a street gang.