Parousia, the Second Coming, the end of time. At the monastery of Saint George, Agata says, the elders keep a grid made of tiles, twelve along one side and twelve along the other, and each time an emperor dies, his name is etched in the appropriate place. “In the whole grid there is but one blank tile left,” she says, “and as soon as our emperor’s name is written, the grid will be full, and the ring of history will be complete.”

In the flames of the hearth Anna sees the shapes of soldiers hurrying past. She touches the snuffbox where it rests inside her dress, and helps Maria dip her spoon in her bowl, but Maria spills the broth before she can raise it to her mouth.

The following morning all twenty needleworkers are at their benches when the servant of Master Kalaphates scampers up the stairs—out of breath and red-faced with urgency—and rushes to the thread cabinet and shoves the gold and silver wire and the pearls and the spools of silk into a leather case, and scurries back downstairs without a word.

Widow Theodora follows him out. The needleworkers go to the windows to watch: down in the courtyard, the porter loads wrapped rolls of silk onto Kalaphates’s donkey, his boots sliding in the mud, while Widow Theodora says things to the servant that they cannot hear. Eventually he hurries off, and Widow Theodora comes back up the stairs with rain on her face and mud on her dress and says for everyone to keep sewing, and tells Anna to pick up the pins the servant spilled on the floor, but it’s plain to all of them that their master is deserting them.

At midday criers ride through the streets declaring that the gates of the city will be bolted at sundown. The boom, a chain as thick around as a man’s waist and hung with floats, meant to prevent boats from sailing up the Golden Horn and attacking from the north, is drawn across the harbor and fixed to the walls of Galata across the mouth of the Bosporus. Anna imagines Kalaphates hunched on the deck of a Genoese ship, frantically checking his traveling trunks as the city dwindles behind him. She imagines Himerius standing barefoot among the fishermen as the city’s admirals look them over. The cut of his hair, the leather-handled knife in his waistband—he tries so hard to give off an illusion of experience and daring, but really he is just a boy, tall and big-eyed, wearing his patched coat in the rain.