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When a five-year-old girl is kidnapped from her birthday party, Don and Terry lead the investigation, but must rely on Charlie's help because the girl's father, Ethan, is also a mathematician. Charlie realizes the kidnapper's motive when Ethan reveal... (more)s he is close to solving Riemann's Hypothesis, a difficult math problem. If solved, the solution could not only earn him $1 million, but could break the code for internet security and unlock the world's biggest financial secret.

Adam Smith, Emma Prescott, Fay Wolf, Greg Zola, Ian Barford, Jamie McShane, Murphy Cross, Neil Patrick Harris, Susan Egan, Tom Irwin