Mia opens by reframing Adam’s disappearance and Eugene’s initial trauma through Occam’s razor: the simplest explanations may be right. She critiques how heuristics and biases lead people to assume nonspeakers lack cognition, confronting deniers who reject evidence of independent typing. She contrasts Dad’s preference for low baselines with her insistence on presuming competence and worth.

Mia describes Eugene channeling anger into progress toward independent typing and joining Anjeli’s weekly hangouts with other nonspeakers. In collaborative poetry, the repeated refrain “I am here” underscores a collective assertion of presence, fueling Mia’s resolve against skeptics.

On the hundredth day since Adam vanished, the family moves toward closure while the case remains technically open. Mia reviews Adam’s possible positive prostate screening, the high false-positive rate, and the scheduled repeat test on June 23. They debate whether the June 23 HQ experiment involved telling select friends about the screening; the family disagrees and accepts they may never know if Adam actually had cancer.

Mia maps a spectrum of explanations about Eugene’s account and the two-page note found in his shorts. She considers evidence that raised doubts—the copier page and abbreviations versus Eugene’s earlier preference for spelling everything out—but rejects worst-case theories. She settles on a middle-ground scenario: a sensory meltdown, Adam trying to help, and an accidental fall. She decides that even if the note were forged to protect Eugene, it wouldn’t determine the truth of Eugene’s story and withholds confrontation, choosing faith in him.

When Mia deciphers Adam’s phone hint—“add all H & add all Q”—she computes a keypad-sum passcode of 4750. Facing a final attempt before auto-wipe, she weighs her desire for proof against Shannon’s cautions and the risk to Eugene. As Mom and Eugene arrive with groceries, Mia enters the code in a way that triggers data deletion. Accepting uncertainty as protection, she returns to the kitchen, helps with heavy bags, and embraces her family.