At one signal site, Oleg left a bent nail on a windowsill in a public toilet to indicate to an illegal that he should pick up cash at a predetermined dead-drop site. The answering signal from the undercover agent, acknowledging that the message had been received, was a beer bottle cap left in the same place. On returning to the spot, Oleg found the cap from a bottle of ginger beer. Was ginger beer, in spy signaling, the same as ordinary beer? Or did this have another meaning? After an intense all-night discussion with colleagues back at the rezidentura he reached the conclusion that the spy
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