Fifteen years after a black-hole "funeral song" faded, radio astronomer Dr. Lena Quyen hears it stutter back to lifean impossible echo laced with structure, as if someone hid a message where no one would dare listen. Breaking the post-disaster Moratorium, Lena and a covert crew board the Kestrel to skim the photon sphere and "listen properly," guided by Orpheus, an unnervingly literal shipboard intelligence, and watched by a director who prefers knives to nouns.
What they find at the edge of a horizon is not poetryit's grammar: prime-spaced intervals, checksums, and a tone that seems to remember our past failures. A single, careful interventiona timing "packet"saves lives upstream in time, and the echo answers with a faint "thank you." Then the orders arrive: Cleanse the mission and erase the proof. The causality meter says green. The law says run.
Torn between caution and discovery, Lena has to thread a lattice of risk, politics, and physics to keep humanity's most delicate conversation alivewithout breaking the world it might save.
If you love:
- The big-idea wonder of The Three-Body Problem and Contact
- The engineering grit of Project Hail Mary
- The ecosystem awe of Children of Time
...then this elegant, high-tension thriller will scratch that "smart sense-of-wonder" itch: precise science, humane stakes, and a voice that treats curiosity as a virtueand a responsibility.
Themes: signal vs. noise, ethics of discovery, small safe steps that change futures, and the stubborn courage it takes to keep listening when fear gets loud.
Perfect for: readers who like hard-SF ideas with human heat, found-family crews, principled rule-bending, and AIs that can beg but not decide.
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