The Parallax Protocol (en Inglés) - S.P. Wagner

On Ephes IX, memory is regulated, identity is monitored, and order is maintained by the Custodian, an intelligence that does not approve of ambiguity.

When an exile arrives and triggers a station-wide anomaly, the system responds as it always does: classify the threat, isolate the variance, restore control. But Ephes IX is not as stable as it appears. Duplicate identities begin to surface. Old histories refuse to stay buried. And the deeper the station looks for a clean answer, the more reality resists being neatly filed away.

As tensions rise and lives begin to overlap in impossible ways, The Parallax Protocol unfolds as a sharp, character-driven science fiction novel about memory, love, control, and the dangerous consequences of mistaking a person for a problem that can be solved.