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In fact, this was the most important moment in Strangways’s day-the time of his duty radio contact with the powerful transmitter on the roof of the building in Regent’s Park that is the headquarters of the Secret Service. Every day, at eighteen-thirty local time, unless he gave’ warning the day before that he would not be on the air-when he had business on one of the other islands in his territory, for instance, or was seriously ill-he would transmit his daily report and receive his orders. If he failed to come on the air precisely at six-thirty, there would be a second call, the ‘Blue’ call, at seven, and, finally, the ‘Red’ call at seven-thirty. After this, if his transmitter remained silent, it was ‘Emergency’, and Section III, his controlling authority in London, would urgently get on the job of finding out what had happened to him.