Diane Farr

FBI Special Agent Don Eppes recruits his mathematically gifted brother, Charlie, to help the Bureau solve a wide range of challenging crimes in Los Angeles. Don is assisted by fellow agents Megan Reeves, David Sinclair, and Colby Granger, while Charlie finds insight and encouragement from a co-worker, Dr. Larry Fleinhardt, and Amita Ramanujan, Charlie's former grad student.

FBI agent Don Eppes couldn't be more different from his younger brother, Charlie, a brilliant math professor at a California university. Don deals in hard facts and evidence, Charlie thrives in a world of mathematical probability and equations. Don and Charlie often combine their areas of expertise to solve a wide range of challenging crimes in Los Angeles.