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To help capture a serial rapist-turned-killer, FBI Special Agent Don Eppes recruits his genius brother Charlie, who uses a mathematical equation to identify the killer's point of origin by working back from the crime scene locations.

Amanda Carlin, Anna Maganini, Anthony Heald, Gibby Brand, Griffin Matthews, James Sie, John Lacy, Karl Calhoun, Kate Norby, Kristen Ariza, Lindsay Frame, Mark Berry, Michele Graff, Richard Saxton, Shawn Green, William O'Leary