When four men go missing the BAU searches for a link between them in order to track them down. J gets upset when her son Henry doesn't want to celebrate Halloween.
A serial killer begins leaving clues to taunt Grissom; Warrick and Nick clash when they investigate a car accident.
A quadruple homicide shatters the serenity of a quiet suburban neighbourhood and Grissom's team sets out to discover the motive behind the bizarre murders.
When a woman's body is discovered in a missing showgirl's swimming pool, the team believes they've got a double murder on their hands.
Grissom and Sara close in on who framed Hodges; a cargo plane lands autonomously at McCarran Airport and everyone on board is dead.