Echoes Beyond the Event Horizon

Fifteen years after a black-hole "funeral song" faded, radio astronomer Dr. Lena Quyen hears it stutter back to life—an 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 poetry—it's grammar: prime-spaced intervals, checksums, and a tone that seems to remember our past failures. A single, careful intervention—a 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 alive—without breaking the world it might save.

If you love:

...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 virtue—and 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.