Leila was halfway through recording a postcard to the Nazdeek Snakes. Jasim was on the porch watering his plants. Leila turned to see him walking through the wall, commanding the bricks to part like a gauze curtain.
They stood side by side, watching the analysis emerge.
A pulse of gamma rays of the expected frequency, from precisely the right location, had just washed over Trident. The beam was greatly attenuated by distance, not to mention having had most of its energy intercepted by its rightful owner, but more than enough had slipped past and reached them for Trident to make sense of the nature of the pulse.
It was, unmistakably, modulated with information. There were precisely repeated phase shifts in the radiation that were unimaginable in any natural gamma ray source, and which would have been pointless in any artificial beam produced for any purpose besides communication.
The pulse had been three seconds long, carrying about ten-to-the-twenty-fourth bits of data. The bulk of this appeared to be random, but that did not rule out meaningful content, it simply implied efficient encryption. The Amalgam’s network sent encrypted data via robust classical channels like this, while sending the keys needed to decode it by a second, quantum channel. Leila had never expected to get hold of unencrypted data, laying bare the secrets of the Aloof in an instant. To have clear evidence that someone in the bulge was talking to someone else, and to have pinned down part of the pathway connecting them, was vindication enough.
There was more, though. Between the messages themselves, Trident had identified brief, orderly, unencrypted sequences. Everything was guesswork to a degree, but with such a huge slab of data statistical measures were powerful indicators. Part of the data looked like routing information, addresses for the messages as they were carried through the network. Another part looked like information about the nodes’ current and future trajectories. If Trident really had cracked that, they could work out where to position its successor. In fact, if they placed the successor close enough to the bulge, they could probably keep that one observatory constantly inside the spill from the beam.
Jasim couldn’t resist playing devil’s advocate. “You know, this could just be one part of whatever throws the probes back in our faces, talking to another part. The Aloof themselves could still be dead, while their security system keeps humming with paranoid gossip.”
Leila said blithely, “Hypothesize away. I’m not taking the bait.”
She turned to embrace him, and they kissed. She said, “I’ve forgotten how to celebrate. What happens now?”
He moved his fingertips gently along her arm. Leila opened up the scape, creating a fourth spatial dimension. She took his hand, kissed it, and placed it against her beating heart. Their bodies reconfigured, nerve endings crowding every surface, inside and out.
Jasim climbed inside her, and she inside him, the topology of the scape changing to wrap them together in a mutual embrace. Everything vanished from their lives but pleasure, triumph and each other’s presence, as close as it could ever be.
7
“Are you here for the Listening Party?”
The chitinous heptapod, who’d been wandering the crowded street with a food cart dispensing largesse at random, offered Leila a plate of snacks tailored to her and Jasim’s preferences. She accepted it, then paused to let Tassef, the planet they’d just set foot on, brief her as to the meaning of this phrase. People, Tassef explained, had traveled to this world from throughout the region in order to witness a special event. Some fifteen thousand years before, a burst of data from the Aloof’s network had been picked up by a nearby observatory. In isolation, these bursts meant very little; however, the locals were hopeful that at least one of several proposed observatories near Massa, on the opposite side of the bulge, would have seen spillage including many of the same data packets, forty thousand years before. If any such observations had in fact taken place, news of their precise contents should now, finally, be about to reach Tassef by the longer, disk-based routes of the Amalgam’s own network. Once the two observations could be compared, it would become clear which messages from the earlier Eavesdropping session had made their way to the part of the Aloof’s network that could be sampled from Tassef. The comparison would advance the project of mapping all the symbolic addresses seen in the data onto actual physical locations.
Leila said, “That’s not why we came, but now we know, we’re even more pleased to be here.”
The heptapod emitted a chirp that Leila understood as a gracious welcome, then pushed its way back into the throng.
Jasim said, “Remember when you told me that everyone would get bored with the Aloof while we were still in transit?”
“I said that would happen eventually. If not this trip, the next one.”
“Yes, but you said it five journeys ago.”
Leila scowled, preparing to correct him, but then she checked and he was right.
They hadn’t expected Tassef to be so crowded when they’d chosen it as their destination, some ten thousand years before. The planet had given them a small room in this city, Shalouf, and imposed a thousand-year limit on their presence if they wished to remain embodied without adopting local citizenship. More than a billion visitors had arrived over the last fifty years, anticipating the news of the observations from Massa, but unable to predict the precise time it would reach Tassef because the details of the observatories’ trajectories had still been in transit.
She confessed, “I never thought a billion people would arrange their travel plans around this jigsaw puzzle.”
“Travel plans?” Jasim laughed. “We chose to have our own deaths revolve around the very same thing.”
“Yes, but we’re just weird.”
Jasim gestured at the crowded street. “I don’t think we can compete on that score.”
They wandered through the city, drinking in the decades-long-carnival atmosphere. There were people of every phenotype Leila had encountered before, and more: bipeds, quadrupeds, hexapods, heptapods, walking, shuffling, crawling, scuttling, or soaring high above the street on feathered, scaled or membranous wings. Some were encased in their preferred atmospheres; others, like Leila and Jasim, had chosen instead to be embodied in ersatz flesh that didn’t follow every ancestral chemical dictate. Physics and geometry tied evolution’s hands, and many attempts to solve the same problems had converged on similar answers, but the galaxy’s different replicators still managed their idiosyncratic twists. When Leila let her translator sample the cacophony of voices and signals at random, she felt as if the whole disk, the whole Amalgam, had converged on this tiny metropolis.
In fact, most of the travelers had come just a few hundred light-years to be here. She and Jasim had chosen to keep their role in the history of Eavesdropping out of their precis, and Leila caught herself with a rather smug sense of walking among the crowd like some unacknowledged sage, bemused by the late-blooming, and no doubt superficial, interest of the masses. On reflection, though, any sense of superior knowledge was hard to justify, when most of these people would have grown up steeped in developments that she was only belatedly catching up with. A new generation of observatories had been designed while she and Jasim were in transit, based on “strong bullets”: specially designed femtomachines, clusters of protons and neutrons stable only for trillionths of a second, launched at ultra-relativistic speeds so great that time dilation enabled them to survive long enough to collide with other components and merge into tiny, short-lived gamma-ray observatories. The basic trick that had built Trident had gone from a one-off gamble into a miniaturized, mass-produced phenomenon, with literally billions of strong bullets being fired continuously from thousands of planets around the inner disk.