The transmitter is removed from Amy's neck

The removal of the transmitter from Amy's neck turns an unexplained military-frequency signal into a physical discovery: the Walker has a device hidden beneath her skin, yet she seems as puzzled by it as the people examining her. The episode joins the larger story of Amy's arrival to the material mystery of how she is being located or heard, without resolving who implanted the device or why.

Signal and Search

Michael tells the others that the Walker is calling them and reasons that the transmitter must be on her person. Her knapsack has already been burned, leaving the girl herself as the likely source. Michael cannot describe the device beyond saying that it must be large enough to contain a power source, so the search begins without a clear idea of what they are looking for.

Sara examines Amy with her permission, working from her feet upward and checking her limbs, hands, and neck before looking through her matted hair. Amy remains still and complies with requests to move, while Peter and Michael turn away at Sara's request. The search narrows from the belongings that are gone to the body that remains: Michael concludes that the transmitter must be inside her, probably close beneath the skin, and suggests looking for a scar.

Discovery Beneath the Skin

At the base of Amy's neck, Sara finds a short, distinct white scar and a raised outline beneath it. She can feel the object's edges and believes it should come out cleanly. The mark turns an abstract signal into evidence of an implanted device, and the location of the transmitter explains why a search of Amy's clothing and possessions could not have found it.

Sara prepares a basin, a scalpel, and spirits, then cleans the area. Alicia assists with tweezers as Sara carefully draws out the object. Peter is so focused on the procedure that he feels, in his fingertips, the instant the tweezers catch hold. The object emerges as a small, oblong disk of shiny metal, fringed with tiny wires; to Peter it resembles a flattened spider. Its unusual construction makes clear that this is not an ordinary mark or accidental object, but the device Michael has been seeking.

Amy's Unawareness and the Unanswered Question

When Michael shows Amy the transmitter, she looks puzzled. Its presence in her neck seems as mysterious to her as it does to the group, so the discovery does not reveal that she knowingly carried or used it. Peter asks whether the Army put it there; Michael can only say that it was broadcasting on a military frequency. The device therefore establishes a connection to military communications without identifying its maker, purpose, or the circumstances of its implantation.

The scene's significance lies in the contrast between the signal's force and Amy's apparent ignorance of its source. The call has drawn attention to her, but the explanation is not a spoken message or a conscious act: it is a hidden object that the group must locate by reading the scar on her body. Removing it answers where the transmission comes from, while leaving the larger questions of agency and intent open.