Without a Trace
The series follows the ventures of a Missing Persons Unit of the FBI in New York City.

Season 6 · Episode 6 ·
Where & Why (II)
Malone's team joins forces with Gil Grissom, a CSI from Las Vegas, and his team as they track a serial killer with ties to New York. The crossover starts on CSI: Crime Scene Investigation S08E06 Who and What (I).
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Episode 6 of season 6 of Without a Trace: “Where & Why (II)”. Aired 2007-11-08. Watch it online free on ZapFlix.