An unusual piece of evidence revealed during a bowling tournament brings the CSIs to investigate a murder at a bowling alley.
The team literally finds themselves in the dark when the investigation into the death of a lieutenant is connected to a city-wide blackout.
After a body falls from the 59th Street Bridge, the CSI team finds a compass near the body pointing east, and realizes it's the third victim of the "Compass Killer."
When the CSIs investigate who or what caused a horrific car accident, both drivers' darkest secrets are revealed.
With the team's help, Vance faces his demons while uncovering a complex relationship with a killer that puts his whole family in danger.
Langston's continued search for a young girl taken hostage as part of a human trafficking operation leads him to investigate a prostitution ring in Las Vegas.
Horatio Caine calls Las Vegas CSI Dr. Ray Langston to come to Miami when a severed leg found in the Everglades is discovered to belong to a girl who went missing in Las Vegas a week earlier.
Las Vegas CSI Ray Langston comes to New York to help Mac and the team try and save a hostage from a human trafficking ring.
Agent Ian Edgerton becomes a murder suspect when the informant he meets with ends up dead, sending a desperate Edgerton over the edge when he takes a member of Don's team hostage.
Nick and Catherine visit a bowling supply warehouse to interview a suspect and follow a trail of bugs to find the decapitated body.
Detective Flack gets beat up on the subway.
When a software company executive bleeds to death on a Manhattan street, the CSIs must delve into the wet and messy world of food "sploshing" parties - where groups of people experience food in an sensual way - to find his killer.
Prentiss and Hotchner get a break in the case through their profile of "The Fox."
Shea comes clean to Sara about how she and Chevy were involved in the murder.
The CSIs realize they are being watched. Meanwhile, the Compass Killer says he has more work to do.
The CSIs find a compass and figure out that the "Compass Killer" is back.
04:15
Criminal Minds - The Work of A Serial Killer
The team begins their search for a serial killer who annihilates families.
The team closes in on the unsub before Hotchner makes a startling discovery.
A body falls from the 59th Street Bridge, interrupting another murder that was about to happen.
Two seemingly unrelated crimes tracked by the CSIs turn out to be connected by a twisted plot of revenge.
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