Declare

apartment. You are to use it only in an emergency having to do with our Party work, understand?”
    “Yes,” he said humbly.
    “If we should ever meet accidentally on the street, don’t acknowledge me—if I’m working I might be under surveillance, by either side.” She had her hand on the doorknob, but paused and looked back at him. “And—if we should find ourselves in a situation where the motivations and identities aren’t clear—there is a code phrase which means, Things are not what they seem — trust me. It is ‘Bless me.’ Have you got that?”
    “Bless me,” Hale echoed.
    She nodded, and her stern manner relaxed for a moment as she grinned and made a cross in the air with her forefinger. Then she was gone, and the tall door closed behind her, and he heard her steps tapping away down the stairs. Many years later he was to learn that they had not even really been working for the Red Army, or not entirely.
    If a perfectly oscillating radio circuit is connected to an aerial, it becomes a transmitter, sending a uniform whistle out over the airwaves on its particular frequency; and if a telegraph key is wired into the leads from the high-voltage battery that maintains the oscillation, the key can break the steady carrier wave into the dots and dashes of International Morse. A receiving set tuned to a point just short of oscillation on the same frequency will pick up the stuttering whistle at great distances—as long as the Heaviside Layer isn’t curling and flexing in the vagaries of les parasites.
    But it often was. On many nights, hunched under a bare lightbulb in the ammonia reek among the brooms and buckets in the custodian’s closet on the roof, with sweaty earphones clamped to his head, Hale would be hearing the signal from Moscow on the 39-meter band— ETC ETC ETC —but be unable to get them to acknowledge his answering signal— KLK KLK KLK DE ETC —on the prescribed 49-meter band or any bandwidth near it. Sometimes he would get weird ghost-echo responses, old signals of his own from the day or week before, as if they had been stuck quivering in the sky until his present agitation of the airwaves had shaken them loose, distorted in their rhythms now and riding a signal as faint as an electromagnetic sigh.
    Very late on one such night in mid-October, when in fact the close-pressing blackness beyond the closet window had just begun to coalesce into jagged rooftop and chimney shapes against a receding sky, he blearily imagined that the rhythm of the parasite ghost-signal was a syncopated counterpoint to his own heartbeat, and so he impulsively began tapping out his call-sign in that same skipping, halting beat; and after only a few newly rhythmic passes he was rewarded with the clear answering signal ETC ETC OK DE KLK QRK RST 599 KN . In the international Q-code this indicated that Moscow had received his signal with perfect strength and clarity and asked him to go ahead. Hale immediately tuned his condenser to the designated working bandwidth and began tapping out the messages he had laboriously encoded with a one-time pad that afternoon:
    FROM PIERRE B-T TOTAL STRENGTH OF THE GERMAN ARMY COLON 412 DIVISIONS COMMA 21 IN FRANCE NOW PERIOD 3 DIVISIONS PREVIOUSLY SOUTH OF BORDEAUX NOW BEING SHIFTED EAST …
    He realized that he was able to send faster than normal when he matched his keystrokes to the quicker-tempo rhythm dancing in his head, even though it involved sometimes slapping the key on a hard double beat, and he realized that he no longer needed the metronome of his own heartbeat in order to follow it—
    FROM EMIL B-T NEW GERMAN GASES COLON NITROSYLFLUORIDE COMMA CACODYLISOCYANIDE …
    —he was almost able to hum the single line of barbaric melody that the fractured intervals seemed to hint at—
    … GERMAN HIGH COMMAND MOVING HEAVY COASTAL AND NAVAL GUNS TOWARD THE MOSCOW FRONT FROM KONIGSBERG AND BRESLAU IN PREPARATION FOR A PROLONGED SIEGE …
    —but he had to grip the edge of the table with his free hand, for the whole building seemed to be rotating with ponderous and increasing velocity, and at the back of his brain and in his spine he was sure that centrifugal force was about to tug him out of his chair. He was blinking sweat out of his eyes to keep reading the numbers he was tapping out, and then tears; the harsh castanet sound of the key seemed to be accompanied by a monstrously slow, far-subsonic pounding that he could feel in his blood, like a slow-motion giant’s