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The Investigator is a construct of the Protomolecule, created using an edited version of Detective Miller's persona, to look into the disappearance of the Protomolecule's parent race.

The Investigator began communicating with James Holden after the protomolecule on Venus launched the self-assembling structures that would become the Ring. It did so by manipulating Holden's brain through unknown means, causing him to "hallucinate" an extremely lifelike apparition of Miller. The Investigator can apparently do this at any range, describing itself as acting in a "non-local" fashion, but it can only maintain the simulation of Miller when Holden is alone. When Holden is in the presence of other people, the demands placed upon the Investigator's simulation abilities become too great and the Miller apparition disappears.

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