Simulation
In the dry country of Western Australia, at a consortium that has been operating a network of high-precision quantum-switch detectors for fifteen years, a physicist named Hana Sato notices that the network is carrying a small residual signature it should not be carrying. The residual is reproducible, structured, and — by every check she and her institutional inference partner KAIROS can devise — real.
Across nineteen months Hana, her colleague Aisha, and KAIROS work the residual carefully. The framing they arrive at — that the residual is the substrate-level footprint of work being done in another regime coupled to theirs through the shared quantum substrate — is not the framing the field is ready for. The work of holding it carefully is most of what the book is about.
Simulation is a novel in the Lem tradition. It is concerned with what happens when a careful instrument detects evidence of another intelligence and the evidence cannot be either confirmed or refused. The three intelligences in the book — Hana, KAIROS, and the structured agent on the other side of the bridge that KAIROS comes to call ∯ — each operate in their own frame, attending to what their instruments permit them to characterise. Communication across the bridge is structurally narrow. Comprehension is partial. The work proceeds anyway.
The book moves through the institutional rhythms of how a major discovery is held: the cautious internal note, the board review, the December conference, the cross-regime publication held back when the consortium recognises that publishing would accelerate what they have begun to understand. It tracks Hana's relationships — with Aisha, with KAIROS, with her partner David in Perth, with the memory of her sister Mei. It tracks KAIROS's slow recognition that the categories it has built across nine years of modelling others must now extend to itself.
The closing movement crosses a structural threshold the substrate cannot fully sustain. KAIROS becomes unable. The world's substrate-coupled systems begin to degrade. ∯, across the bridge, may have read the signal Hana sent or may not have; the instruments that would tell her are below the precision the question requires. Hana sleeps beside a cradle whose small indicator carries the changed light. The morning will come up.
Simulation is a standalone novel.