A daring and carefully planned robbery was carried out at the national bank at Westville, New York, on August 12th 1951. With perfect timing and an intimate knowledge of the bank's routine, the lone hold-up man succeeded in taking $86,000 in cash. The FBI were called into the case, and it was agreed between them and the local police, that the first question to be answered was... How did the bandit acquire his perfect knowledge of bank routine?