The dramatic third season of Numb3rs finds dedicated FBI agent, Don Eppes and his younger mathematician brother, Charlie Eppes, continuing to take on the most confounding criminal cases, observing them from a very distinctive perspective. This season though, Don finds himself in conflict with his co-workers and his family, while the danger and stress of his work drive him to an increasingly dark place. Charlie must turn from being the younger brother and son and learn how to provide support and advice to his brother and father. Alan realizes that he wants to find new challenges in life, even as he realizes that it's now his older son who may need him most. Larry tries to balance his obsession with his work with a chance at a relationship with FBI agent Megan Reeves.