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There are other intriguing questions about Koecher's behavior. He and Hana, who are childless, were planning a new life in Austria before Karl confessed. "We saw them at a farewell dinner in our home," says one friend. "There was no indication they were apprehensive." The day before the Koechers' arrest, they sold their cooperative apartment for more than a quarter of a million dollars. Did they believe the FBI would simply let them take the money and run? The Koechers, says their lawyer, were "doublecrossed" by the FBI. He would not elaborate. -