Even in New York's violent history, it was one of the strangest mysteries ever seen.
The 82-year-old socialite and heiress Irene Silverman vanished from her Upper East Side mansion.
A fifty-strong team of FBI and NYPD officers scoured the city's streets, trying to find an old woman who had vanished without trace.
No one knew if she was dead or alive.
[Edited for length - MODERAT0R].
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