Ep 4. The Mole

In Numb3rs season 3 episode 4, titled "The Mole," FBI Agent Don Eppes and his team join forces with Behavioral Analysis Unit consultant David Sinclair to investigate an underground fighting ring that's been linked to an illegal weapons trafficking operation.

Using analytic methods and mathematical equations, Don and David sift through the evidence to uncover the network's key players. Meanwhile, Don struggles to keep his personal feelings for his ex-girlfriend and fellow agent, Liz Warner, at bay as the case brings them together again.

As the investigation intensifies, the team realizes they have a mole within their own ranks, and they must race against time to unmask the traitor before more lives are put in danger.

Throughout the episode, viewers get a glimpse into the inner workings of the underground fighting scene, complete with brutal combat and high stakes gambling. As tensions mount and the case becomes more dangerous, the team must rely on their mathematical expertise and quick thinking to stay one step ahead of their adversaries.