Peeps – Scott Westerfeld (2005)

Peeps by Scott Westerfeld, published in 2005, is a gripping fusion of horror, science fiction, and urban fantasy that reinvents vampire lore through the lens of parasitology. Set in a gritty, contemporary New York City, the novel follows Cal Thompson, a college freshman who discovers he is infected with a parasite that gives him enhanced abilities—but turns others into monstrous, cannibalistic creatures known as “peeps.” As a member of the shadowy Night Watch, Cal hunts down the infected he unknowingly spread the disease to, even as he searches for the elusive woman who infected him. Peeps is the first novel in a duology, followed by its sequel The Last Days.

Plot Summary

A year had passed since the parasite had taken root inside Cal Thompson. He hadn’t asked for it – just a drink, a night of impulsive pleasure with a mysterious girl named Morgan, and suddenly his biology didn’t belong to him anymore. What followed was no ordinary infection. It turned most into ravenous monsters with black claws, glowing eyes, and an aversion to everything they once loved. But Cal wasn’t like most. He was a carrier – immune to the madness, still himself, but cursed with hunger, heightened senses, and a constant awareness of the disease he carried in every cell. A walking contagion.

The Night Watch found him before he could do more damage. They were the secret force behind the myths – vampire hunters who didn’t need crosses or holy water. They hunted the parasite-positives, or “peeps,” tracking the infected through their rat broods, signs of decay, and statistical anomalies. Cal was recruited as a hunter, uniquely suited to track the ones he had infected before he even knew what he was. And at the top of that list was Sarah, his first real girlfriend.

When he found her in a crumbling ferry terminal in Hoboken, it wasn’t rage or hunger that greeted him. It was silence. Her lair was filled with bones, smeared mirrors, and the glitter of rat eyes. She was a peep now, and yet, something in her still remembered him. When she spoke his name, it was like a whisper through dried leaves. Cal approached with caution, brandishing Elvis memorabilia – her former obsession, now her greatest fear. Anathema. Peeps were driven mad by reminders of their past loves. And Sarah had loved Elvis almost as much as she had loved Cal.

The confrontation was brutal. She was faster, stronger, a monster with slashing claws and the strength of five men. But the sight of the King on black velvet paralyzed her, and Cal took his chance. He slipped sedatives into her throat and watched as she shuddered into unconsciousness. The Night Watch arrived with their makeshift ambulance – a garbage truck. Sarah was taken to a facility in the wilds of Montana, where the infected could be kept sedated and safe, far from cities, far from the people they might still remember.

But the victory tasted hollow. Sarah had known him. And that meant something inside her hadn’t been entirely lost. It left Cal with a question he couldn’t shake – could any of them come back?

Dr. Prolix, the Night Watch’s ancient psychologist, offered little comfort. Her centuries of experience said no. The anathema was irreversible. But she also hinted at obsession, at a kind of dark love that clings like fungus even when the mind is eaten away. Sarah had nested where she could see Manhattan – her favorite city, now a source of horror. She hadn’t run far from the thing she hated most. Perhaps it wasn’t hate after all. Perhaps it was obsession dressed in decay.

Sarah, though, wasn’t the root of the problem. Cal had infected her, but someone had infected him. Morgan. The name alone brought back flashes of a long-forgotten night – a frozen banana in a Bahamalama-Dingdong, a flirtatious smile in a leather-heavy gay bar, a stumble along the Hudson River toward oblivion. He couldn’t remember the building, the street, the way back. Just her name and the cocktail that had sealed his fate.

A break came in the form of a flyer – Dick’s Bar was reopening. The Home of the Bahamalama-Dingdong. Cal returned to the scene, retracing steps through the haze of fruit-flavored alcohol and old mistakes. The bar was unchanged, still brimming with leather and disco, but Morgan was a ghost. No one remembered her. No one remembered a goth girl seducing a confused Texan. The trail ended where it had started, in oblivion.

While the search for Morgan stalled, another mystery emerged. Strange disappearances. Rats acting erratically. The parasite was moving underground – literally. Tunnels beneath Manhattan, once used by the city’s earliest settlers and long abandoned, now housed something older, darker, and more terrifying. A nest. Something ancient and buried, waking up.

Cal teamed up with Lace, a smart, stubborn journalism student with more curiosity than caution. She followed him after a tip led her into the web of secrets he’d tried to leave behind. When she discovered the truth, she didn’t run. Instead, she helped. Through her, Cal learned that the parasite wasn’t just evolving – it was planning.

Together they descended into the depths of the city, beneath the subways and deeper still, where maps no longer applied. There, they found the truth: the parasite had a master. A being not quite human, not quite alive, buried beneath centuries of myth and dust. The Master Parasite. This ancient host had once brought down civilizations, reemerging every few thousand years when conditions were ripe. It was awake now, feeding on rats, spreading spores, manipulating its offspring through instinct and fear.

The Night Watch couldn’t contain it. Their weapons and traps were for individual peeps, not an ecosystem-level threat. Cal, Lace, and Dr. Rat improvised – biological warfare using engineered pathogens, controlled collapses of tunnels, and weaponized anathema. They turned the parasite against itself, seeding the underground with memories, icons, and chemical triggers that sent even the most hardened peeps into madness.

It worked. The nest began to implode, devouring itself in a frenzy of panic and regression. The Master Parasite was sealed, weakened, maybe even dead. But the victory came at a cost. Cal and Lace had bonded, drawn together by blood, fear, and shared danger. But he was still infected, still a carrier. They couldn’t be together. Not without risk. Not without regret.

So he walked away. Back to the Night Watch, back to his next assignment. Somewhere in the city, Morgan was still out there. The beginning of his bloodline. And the end of it, too, if he ever found her.

For now, the city slept. The rats returned to their alleys. The infected rested in their mountain beds. But Cal remained on the edge – not a monster, not entirely human. Just a boy with too much knowledge and too many memories, watching the skyline shimmer in the dark, waiting for the next tremor beneath the streets.

Main Characters

• Cal Thompson: The protagonist and narrator, Cal is a nineteen-year-old biology student turned Night Watch hunter. After a one-night stand with a mysterious woman named Morgan, Cal becomes a “carrier” of a parasitic infection that heightens his senses and physical abilities without turning him mad. His journey is a blend of guilt, science, and self-discovery, as he navigates love, duty, and the strange biology of his new reality.

• Sarah: Cal’s first real girlfriend and the first person he unknowingly infects. Once vibrant and obsessed with Elvis and Manhattan, Sarah becomes a full-blown peep. Her descent into madness haunts Cal, and her complex response to his reappearance—recognition mixed with hatred—underscores the emotional cost of the disease.

• Dr. Prolix (The Shrink): An enigmatic and ancient figure within the Night Watch, Dr. Prolix provides psychological guidance to hunters like Cal. With centuries of experience and a chilling calm, she offers insight into the parasitic condition and its emotional aftermath, pushing Cal to confront his unresolved feelings and find his “progenitor.”

• Dr. Rat: A quirky and brilliant rat expert at the Night Watch, Dr. Rat aids Cal with tracking and containment. She balances her affection for rodents with a clinical dedication to extermination when needed. Her eccentricity adds levity and scientific rigor to the narrative.

• Morgan: The mysterious woman who infects Cal. Though she appears only in fragments of memory, Morgan’s shadow looms large over the plot. Her identity and motives remain a mystery, representing the key to both Cal’s past and the future of the disease’s spread.

Theme

• Parasitism and Identity: The core metaphor of the book—parasitic infection—raises questions about agency, free will, and the body’s autonomy. Cal’s transformation blurs the line between human and host, forcing him to reconcile his actions with a parasite’s urges.

• Love and Anathema: One of the novel’s most compelling ideas is the anathema effect—how peeps are driven to hate what they once loved. The twisted relationship between memory, obsession, and disgust underpins Cal’s encounters with his former lovers, especially Sarah, illustrating how love can be weaponized.

• Science vs. Superstition: Westerfeld grounds vampire mythology in biology, replacing folklore with scientific explanations. Parasites, vectors, and evolutionary strategies replace garlic and wooden stakes, offering a modernized and chillingly plausible take on ancient fears.

• Urban Decay and the Natural World: As peeps retreat into abandoned places, Westerfeld contrasts the crumbling infrastructure of cities with the resilience of rats and parasites. Nature’s ability to reclaim human spaces becomes a motif for how primal forces—biological or emotional—endure beneath civilization’s surface.

• Responsibility and Guilt: Cal’s mission is deeply personal, driven by remorse and the moral weight of his actions. His guilt becomes a psychological parasite of its own, one that guides his choices and fuels his need for redemption.

Writing Style and Tone

Scott Westerfeld’s prose is sharp, kinetic, and deeply informed by scientific curiosity. The novel alternates between fast-paced narrative chapters and nonfiction-style interludes that detail real-world parasites and their terrifying adaptations. This alternating structure educates as much as it horrifies, reinforcing the scientific plausibility behind the fictional parasite and adding a chilling depth to the story.

The tone is dark yet laced with sardonic humor. Cal’s voice—wry, self-aware, and occasionally vulnerable—provides a steady compass through the novel’s moral ambiguity and biological horror. Westerfeld uses vivid imagery and metaphor, especially in describing parasitic behavior, to evoke disgust and fascination simultaneously. The world feels lived-in, dense with rot, vermin, and the ghosts of a modern city being consumed from the inside out.