Day–night cycle

The day–night cycle in the novel works on two scales: it makes time visible in the changing city, and it sets the terms of survival in the confrontation with the Troll. Night can shelter people from notice, but it also prolongs fear; dawn is not merely a new day but a material limit on what the monster can do.

Historical Time in the Changing City

At Jamaica Station on the Long Island Rail Road, Apollo Kagwa encounters time as layers that remain perceptible beneath renovation. The station’s 2006 rebuilding brought new platforms, street-level elevators, escalators, and a pedestrian bridge to the AirTrain serving John F. Kennedy International Airport. A steel-and-glass canopy protects passengers from bad weather while leaving the platforms open to the air. To Apollo, the result differs sharply from the station he remembers from the 1980s, like Dresden after bombing and Dresden in the present. Yet he can still imagine the old platforms and the earlier street-level Jamaica.

That layered view expands beyond living memory. Apollo wonders whether his mother would have recalled a still earlier Jamaica, first encountered as a young immigrant. He imagines that a person a thousand years old would remember marshland where the city now stands and Jamaica Avenue as the Old Rockaway Trail, used by the Rockaway and Canarsie Indians. In the 1800s, workers dredging nearby Baisley Pond found remains of an American mastodon; a sculpture of one later stood in Sutphin Playground. These changes do not erase what came before: each account informs the next. The scene presents history not as a single, settled telling but as successive revisions, a long temporal perspective against which the daily alternation of light and darkness is only one measure of change.

Night as Refuge and Vigil

On North Brother Island, night gives the returning women and children a place outside the ordinary rhythms of New York City, though not a place free of danger. By 1981 the smallpox patients were gone, and war veterans and drug addicts had also been evacuated. The island became known for its black-crowned night heron colony, which persisted for more than twenty years before the birds abandoned the island early in the twenty-first century. Their departure had seemed a minor birding mystery. Apollo discovers that the women and children have displaced them.

The newcomers have made the Nurses’ Residence their base rather than entering the more structurally sound Tuberculosis Pavilion. In the damaged building, they repair window openings with clear plastic. At night, firelight flickers against it; from a distance, the fire on the second floor looks less like a domestic hearth than a signal guiding people back to a fixed point. Women move between the Nurses’ Residence and the Doctor’s Cottage, while children peer through the makeshift panes. The island lies less than four miles from Apollo’s apartment, but in the dark it seems to belong to a wilderness far removed from the city.

For Emma Valentine, night means guarding Brian Kagwa rather than resting. When Apollo asks when she last slept, she explains that she stays awake through the night to keep him safe. Her vigilance gives the cycle a human cost: while the hours pass, a mother remains alert because the child’s safety cannot be entrusted to darkness or to anyone else. The Troll’s daytime sleep makes the reverse rhythm equally stark. Emma’s sleeplessness and the creature’s dormancy are opposing uses of the same hours: one is a deliberate watch, the other a constraint imposed by daylight.

The Troll’s Hours and the Failed Imitation of Day

In the cave, the distinction between night and day becomes a rule with immediate stakes. Emma tells Apollo that the Troll sleeps when the sun is up. The family therefore waits for morning, even though Brian is inside the creature and Apollo cannot bring himself to ask aloud whether the child is still alive. Emma answers his unspoken fear by touching her belly and insisting that a mother knows. Their hope depends on surviving the night until the Troll’s daytime vulnerability can be tested.

Before true dawn arrives, Emma calls out that the sun is rising. Apollo understands her attempt to exploit the Troll’s fear and repeats the warning as he runs toward the tunnel, hoping to draw the creature out and give Emma and Brian a chance to escape. The Troll turns in confusion, looking toward the sound and then upward as if it could strike away the threat. But the light being wielded in the chamber is not the sun. The iPad’s battery is nearly depleted, and its shining display cannot make the monster turn to stone. The distinction is consequential: an electronic image can resemble a star, but it cannot replace the actual arrival of daylight.

The diversion also fails to save Brian at that moment. As the Troll follows Apollo’s movement, it reaches back, finds the child, and swallows him whole. The night’s danger therefore intensifies even as the characters invoke morning. Their words can unsettle the creature, but they cannot bring the day forward or reproduce its force.

Sunrise as Release and Boundary

The rescue succeeds only when the cycle completes itself. Apollo and Emma find Brian inside the Troll’s body, still alive, and pull him out. They crawl away as the sun rises. True daylight reaches them and the monster: it trembles, stiffens, loses its sickly green color, and turns to stone. After a final whimper, its body breaks apart into what looks like a mound of boulders, an ordinary small hill in the Northern Forest to a passerby.

Emma immediately carries Brian toward the woods along the path they had taken the night before. Apollo remains behind. He approaches the stones, finds the largest one that had been the Troll’s head, touches the depressions where its blind eyes had been, and presses his forehead to the stone. The dawn ends the immediate danger, but Apollo’s lingering gesture gives the transition another meaning: he understands himself as finally burying what had haunted him since childhood, not his father but his fatherlessness. Sunrise thus marks both a literal boundary on the Troll’s power and the close of a night in which old fear has become present danger. Across the novel, the cycle is never merely background time: it shapes shelter, demands vigilance, exposes the limits of imitation, and makes survival depend on the arrival of the real day.