The Penumbral Index
Author: Yara Hallowell (author page)
Every correction leaves a shadow.
Price: $ 4.99
Price: £ 12.99
Blurb
It’s the year 1937. Air-raid drills drop the city of Hallowmere into darkness three times a week. Marta Vance, a junior librarian in the Public Record Library, is expected to lock her desk, dim her lamp, and wait it out.
Instead she hides a forbidden tool: the Penumbral Index, translucent sheets that only align in low light and reveal what the official ledgers erase. Every drill, another catalog card goes missing. Every alignment points toward a sealed sub-level and a new set of names marked for “precautionary custody.”
Marta’s husband already disappeared under the same euphemism. The Index finally shows her the truth: the blackout is cover for raids, and tonight’s list includes people she knows. With one extended drill as her window, she must use the Index, a borrowed lock code, and an inspector’s misplaced trust to break into the purge room—and decide who, if anyone, she can pull back from the dark.
Story
(Excerpt from “The Penumbral Index” by Yara Hallowell)
In the quiet moments, when a drawer slid shut with its soft wooden thud and no one stood at the counter, she let her mind rest for a few breaths on the three lives she had tilted.
Matthew Holt, held in review. Tomas Renn, on a rail line near a river. The stranger marked with the star, somewhere under another roof.
Daniel, absent from every ledger, present in the way her hand moved, in the way Howe’s voice changed on certain words, in the slight hesitation before Corin told a clerk to stamp a harsher code.
The Penumbral Index was gone from the building. Its crate would soon sit in some windowless archive room, its contents photographed, catalogued, perhaps broken up or destroyed once someone decided their methodology was no longer needed.
The pattern it had revealed did not vanish with it.
Format: Ebook / Paperback
Length: Full-length novel, approx. 63 000 words · 248 pages
Genre: Literary speculative fiction
Story scope: Prequel in The Hallowell Lectures series
Tone: Quietly tense, procedural, morally sharp; low-spectacle, high-pressure
Facts
Good to know: The “action” is administrative—blackouts, ledgers, Security protocols, and the Index sheets that reveal hidden routes between records.
Explore further
More titles by Yara Hallowell are available on the
books page.
Ideal for readers who like: Slow-burn institutional suspense, controlled prose, rule-systems, and protagonists who resist through precision rather than speeches.
Content note: Themes of state control, forced disappearance via bureaucracy, and sustained psychological stress; no gore-forward violence.