|Wet Foot/Dry Foot|
|Original Airdate||October 2, 2002|
|Previous Episode: Losing Face|
|Next Episode: Just One Kiss|
Horatio is crushed when his former mentor, Al Humphries, is killed while trying to disarm a necklace bomb placed around the neck of Colombian importer Aurelio Moreno. Determined to track down the bomber, Horatio has his team scour Moreno’s house, looking for the remains of the bomb. Calleigh finds a mesh material she identifies as French lace, indicating the bomber gained access to the house through an unlocked window. After they fail to find the trigger among the remains in the house, Megan Donner thinks to check the boots of the firemen who responded to the call, and Horatio finds a photo cell stuck in the treads of one of the men’s boots. After discovering the paper used by the bomber for the ransom note was imported from Colombia by none other than the victim, Delko speaks with US Customs officer Charlie Berenger, who shows Delko Moreno’s wares as well as a picture of Moreno’s wife from Bogotá—who is clearly not the same woman living with Moreno. Realizing Moreno had two wives, the CSIs question his American wife, Julisa, and his Columbian wife, Lauriana, and swab both of their hands. When Lauriana’s hands pop positive for TATP, which was used in the bomb, Horatio thinks she’s the culprit, but Megan is certain the two women don’t know about each other, and notes that TATP is common ingredient in hair dye and nail polish.
Megan is proved right when a call comes in that the bomber has struck again: a businesswoman named Mara Bergos was attacked in her kitchen. Horatio joins the bomb squad and guides his former colleague, Kat, through disarming the bomb only to find it’s a fake, filled with sand and nothing more. Outside the house, Horatio spots a boy on a bike with a package, both given to him by a strange man. Using a robot called ANDROS, the bomb squad targets the detonator and disarms the bomb, but the location clues Horatio in that the actual target was the bomb squad. Megan recovers a hair from the bomber from the boy, finding it’s from a toupee. Calleigh connects the French lace from the window to the hair, noting that French lace is used in toupees. That, along with the counterfeit parts used to make the bomb and the insecticide found on it, leads Horatio to US Customs, specifically Charlie Berenger, who handled the imports of both Aurelio Moreno and Mara Bergos. Horatio confronts Charlie in the warehouse where he works and finds the customs officer wearing a necklace bomb. Bitter about being ejected from the bomb squad by Al Humphries, Charlie decided to get revenge on the squad. Horatio tricks Berenger into letting him disarm the bomb, and Charlie is arrested. At Al’s funeral, Horatio thanks Megan for her help.
- Detective Adelle Sevilla is introduced for the first time.
- It's also revealed that Sevilla is fluent in Spanish.