Pritchard reveals that Thad Beaumont had an absorbed twin: during a call with Alan Pangborn, the surgeon explains that Thad’s childhood brain mass was not an ordinary tumor but surviving tissue from a second fetus. The disclosure supplies a medical history for Thad’s severe headaches and seizure, and gives new weight to the story’s recurring question of whether one person can contain two selves.

The revelation to Pangborn

Pangborn contacts Pritchard while investigating Homer Gamache’s murder in Castle County. He is trying to assess Thad as a possible witness, but hesitates because Thad is famous and appears to be exhibiting symptoms Pritchard once treated. Pangborn begins by asking whether the old brain tumor might have returned. Pritchard immediately recognizes the patient as Thaddeus Beaumont and doubts that the symptoms indicate a recurrence.

When Pangborn asks what happened during the original operation, Pritchard asks to tell the story in his own way. He recalls that Thad eventually suffered a seizure, after which doctors found a small mass in the prefrontal lobe. They operated on the assumption that it was a tumor; what they found, Pritchard says, was Thad’s twin. The change in Pangborn’s understanding is immediate: a medical question about a possible recurrence has opened onto a highly unusual account of Thad’s beginnings.

What the operation found

Pritchard places Thad’s case within the broader phenomenon of fetal twin absorption. Twins, he explains, are often absorbed in utero, but incomplete absorption is rare. In Thad’s case, some tissue from the other twin retained its integrity and became entwined with the tissue that formed Thad’s brain. Its location in the prefrontal lobe was unusual, as was its later growth.

Pritchard believes the remaining tissue became active not long after Thad turned eleven. Normally, he says, such tissue remains inert; in this instance it began to grow, eventually creating the pressure associated with Thad’s childhood symptoms. The surgeons removed it successfully. His account describes an operation with a concrete medical result—the mass was excised—but leaves the origin and renewed growth of the tissue strikingly strange.

Pangborn asks whether Thad had somehow eaten a brother. Pritchard allows that the other twin could have been a sister, but suspects it was a brother, reasoning that absorption may be less common in fraternal twins. He qualifies this as statistical inference rather than established fact. His explanation distinguishes the prenatal process from an intentional act: he presents it as a biological imperative, not as murder. The identity of the twin is therefore partly known and partly unresolved; the surviving tissue was real, while its sex remains Pritchard’s informed conjecture.

The childhood symptoms return

The explanation connects the operation to the illness Thad endured in 1960. His headaches began in August and intensified by September into episodes so severe that he could only lie in a darkened room. He sometimes hoped he would die, then feared the pain might not kill him. The symptoms culminated in the seizure that led to the discovery and removal of the mass.

The bird sounds belong to the same medical history. Before the headaches, Thad heard what seemed to be the distant cheeping of many small birds and imagined sparrows gathering on telephone lines and rooftops. Years later, he identifies the sound to Liz as his auditory sensory precursor: a warning associated with the brain condition, rather than a smell of the sort commonly reported by people with brain tumors.

When the sounds recur, Thad makes an appointment with Dr. Hume. He reports two episodes resembling the bird sounds that preceded his illness, but says the headaches have not returned. He does not tell Hume about his trance, what he wrote during it, or the writing found at a murder victim’s apartment in Washington, D.C. Hume nevertheless takes the recurrence seriously and orders cranial X-rays and a CAT scan. The medical past thus becomes active again, but the evidence does not equate the returning sounds with a confirmed return of the removed tissue.

A second self and a story of doubles

Pangborn’s response carries the revelation beyond diagnosis. After hearing that part of another twin remained within Thad, he thinks of Thad as having always been two men: one living in the ordinary world and one creating worlds. The thought links Pritchard’s biological account to the novel’s central tension between Thad and George Stark, the separate identity Thad adopted to escape writer’s block.

Thad’s own account of choosing the name George Stark makes that connection more specific. He had wanted an identity separate from his own, and took inspiration from crime writer Donald E. Westlake’s Richard Stark pseudonym and its professional thief, Parker. Thad describes Parker as nearly a killer robot, driven by one overriding aim; the interviewer connects that model to Alexis Machine, the central figure in the George Stark novels. This history does not prove that the prenatal twin caused Stark’s existence. Instead, the episode places two kinds of doubling beside each other: the biological remnant Pritchard removed and the authorial identity Thad created, which becomes dangerously real within the story.

That distinction matters to the murder investigation as well. Thad jokingly sketches a theory in which an identical twin could have hosted his party while Thad committed Gamache’s murder, then taken his place in the rest of his life; Liz laughs, and Pangborn is openly surprised. The imagined alibi plays on the very secret the reader now knows, but it is not evidence that a surviving twin is living outside Thad. Pritchard’s revelation concerns tissue absorbed before birth, not a second adult who could have acted in Thad’s place.

Consequences and significance

The event changes the meaning of Thad’s childhood illness by giving its cause an identity: what doctors first called a tumor was tissue from the twin that had not been fully absorbed. It also gives Pangborn a clinical history against which to consider Thad’s symptoms, while leaving the more recent bird sounds and trance unexplained by a confirmed diagnosis. The old operation offers a grounded account of the headaches and seizure, but does not settle the present mystery.

Pritchard’s explanation also works as a revelation about divided identity without collapsing metaphor into medical fact. The unabsorbed twin is a physical remnant with a documented history of growth and surgical removal; George Stark is a writing identity that Thad deliberately fashioned and that the novel treats as an independent threat. Their resemblance lies in the story’s pattern of the one becoming two, not in a demonstrated causal link. By making Pangborn hear the medical account before he fully understands the supernatural conflict, the scene lets an intimate biological history unsettle an investigation—and makes the idea of a second self both literal in one sense and unresolved in another.