Once Upon a Time
What sets off the alarms?
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From the text:
".... and when the little boy's pet cat tried to climb in by the fanlight to keep him company in his little bed at night, as it customarily had done, it set off the alarm keening through the house.
The alarm was often answered it seemed by other burglar alarms, in other houses, that had been triggered by pet cats or nibbling mice."
Once Upon a Time