- A young boy and his babysitter are murdered. The case is similar to an open child abduction case, so FBI agent Jack Malone comes in to investigate. Part one of a crossover with "Without a Trace."
- In a crossover episode with Without a Trace (2002) Catherine and Grissom work with FBI Agent Jack Malone when a palm print at a Las Vegas crime scene matches that taken at a New York crime scene 6 years previously. In the older case, a babysitter was killed and the four year old in her care, Jason Taylor, was kidnapped. In the Vegas case a woman, Carmen Davis, and a young boy are killed in her home. DNA confirms that the boys are not the same person but confirms that the perpetrator was responsible for at least two other murders. When a patrolman is killed, the killer has yet another victim. (the story continues on Without a Trace Episode. 6.6)—garykmcd
- Team Grissom is astonished that their crime scene, the home murder of babysitter Carmen Davis and her charge, is frozen until the arrival from New York of FBI Agent Jack Malone. He hopes it's the big break in the 6 year old case where the boy and only witness, Jason Taylor (4), for whom no ransom is asked, was kidnapped. Captain Jim Brass must switch from courteous cooperation to restraining Malone's abusive 'interrogation'. Team Grissom works out the apparently unsatisfactory theory that despite MO variations, both are part of possibly joint serial crimes, until Grissom realizes the railroad links them and even more case. Clever forensics and security camera recording analysis put them on the trail of the killer, whose bloody trail still eludes them out of Vegas.—KGF Vissers
- When a babysitter is raped and murdered and a boy is murdered, Grissom arrives in the crime scene and sees the coroners waiting outside the house. Catherine and Greg explain to Grissom that they had to stop to process the scene by order of the FBI. Soon an helicopter brings the FBI Agent Jack Malone, from New York, and he explains that the case is similar to one that happened six years ago in New York. They team-up since Quantico has many cases to process and is overloaded. Soon they find a suspect, but the man is innocent. When an old couple is murdered in the same MO, they find a track to be followed.—Claudio Carvalho, Rio de Janeiro, Brazil
- When a woman and a young boy are murdered in a house, CSI processes the scene, but they get a special visitor from the FBI: Jack Malone. Malone flew in because there was a hit on VICAP to a palm print found in the house that echoes a NY kidnapping case six years back. An adopted boy was taken from his home and his babysitter was murdered. He's been missing ever since.
Evidence from the house leads to a poker player from Utah; his son and his ex-girlfriend were the vics in this case. He wasn't involved in their deaths. But DNA from the woman's body matches that of two other rape-murders in CODIS; one in Wyoming and the other in Idaho. A short time later, another rape-murder turns up, this time with the victim's husband killed as well. Sara takes the case hard; the constant bad news is getting to her.
Grissom and Malone realize that the killer is riding the freight train to various points, then hopping off and killing innocent people as he likes. They track him to a casino, only to find he's abducted a woman and killed a police officer as he fled the area. Later they find that the man, Terry Wicker, has also taken a young boy from a local school. When they come across the vehicle the man was driving, they find the missing woman in the trunk and ID her as Wicker's ex-wife, and the mother of the boy Wicker has taken. It's appears that the man came back to find his son, and perhaps take revenge on his ex.
Meanwhile, Wicker leaves town on a bus, with his son beside him.
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