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As the FBI increases the reward to $100,000, the case has become a collision of two worlds: the methodical, evidence-based work of federal investigators and the rapid-fire, speculative world of online detectives. Whether the “sleuths” have spotted a detail missed by the experts or are simply chasing shadows in a grainy video remains to be seen. What is certain is that every hour counts for Nancy Guthrie, and the “man in the mask”—whoever they are—is now the target of one of the most intense manhunts in recent Arizona history.