Two people grab Dr. Amita Ramanujan (Navi Rawat) as she and her boyfriend, Dr. Charlie Eppes (David Krumholtz) leave CalSci for dinner.
Don and FBI Special Agents Liz Warner (Aya Sumika), Nikki Betancourt (Sophina Brown), David Sinclair (Alimi Ballard), and Colby Granger (Dylan Bruno) begin to search for Amita.
With Don and Charlie en route to their location, David and Colby follow the getaway jeep into a parking garage.
The next day, David, Colby and FBI Special Agent Ian Edgerton (Lou Diamond Phillips) find several pieces of carved wood outside of Amita's office at CalSci.
At the FBI office, Ian informs the team that Amita's kidnapper is Mason Dureya (James Callis), who leads a cult consisting of women who possess high school educations.
At CalSci, David and Colby arrest Piper St. John (Sarah Drew), a member of Dureya's cult who arrived to retrieve Amita's notebook computer.
After David insists that the fraudulent charges' prices are a numerical clue, Charlie realizes that the numbers are an IP address (275.3.60.28) that Amita is using as a mirror site.
Back at the FBI office, Larry, David, Colby, and Liz celebrate the case's successful resolution while Nikki and Ian leave for a date.
In separate TVGuide.com interviews, actors Rob Morrow [1] and Alimi Ballard[2] mentioned the season finale was a cliffhanger.
Numb3rs series regular Navi Rawat told Adam Bryant in a TVGuide.com interview that, in contrast to her other dangerous situations, Amita's kidnapping was unexpected and intense for her.
[6] A British actor, he had previously played an American twice before, once in the BBC series "A Dance to the Music of Time" and the other in "West End".