Literary Mystery

Copley
O'Neal

Character-driven novels set within the long light of the California coast. Stories of place, and what we keep hidden from that very light.

Out Now  ·  A Death on Halconido

“A fresh and thought-provoking entry in the ecological murder mystery genre.” Kirkus Reviews

Kirkus Reviews verdict: GET IT
Portrait of author Copley O'Neal

About

A few words
about the work.

Copley O'Neal writes literary mystery novels in the tradition of P.D. James, Ruth Rendell, and Tana French, fiction that highlights character and the slow gathering of truth. A Death on Halconido follows Luiseño Detective Will Aguayo as he works a case on the San Diego mountain above his valley home, hunting for leads into the death of talented ornithologist Dr. Brandt Holme. But, as Aguayo soon finds out, the mountain community of Halconido has no intention of giving up its secrets that easily.

Another novel, The Garden Fair, is in progress.

Before she turned to writing fiction, Copley O'Neal taught writing to students at almost every grade level—elementary through university—and translated short stories and novellas from Russian into English. She holds degrees in Russian, Slavic Language and Literature, and Educational Leadership. Her doctoral dissertation was on Leo Tolstoy as a social reformer, though she'd rather be reading Chekhov.

She lives near the Pacific and writes before sunset.

"Motive may not be necessary to prove in a court of law, but it is the hardened axis on which every good mystery spins." — On A Death on Halconido

Books

The work, so far.

Cover of A Death on Halconido by Copley O'Neal — an art-nouveau-style illustration of pines, water, and mountains framed in gold on dark cloth.
Available Now · Novel

A Death on Halconido

A Novel

Brandt Holme was a brilliant ornithologist — meticulous, exacting, and not especially loved. When Dr. Holme is found dead on his Halconido property, Detective Will Aguayo suspects murder. But every lead fragments into more questions. The family is challenging. The neighbors are hostile. The environmental activists are hiding something. And the evidence doesn't behave the way evidence should.

Aguayo is Luiseño, raised in the valley below this mountain, now sleeping in a rebuilt ancestral shelter as he works the case. The land speaks to him in ways he's only beginning to understand. But understanding won't be enough. To catch this killer, he'll have to see past decades of buried resentment — and recognize a kind of brilliance no one thought to look for.

“A fresh and thought-provoking entry in the ecological murder mystery genre.”

Kirkus Reviews

Kirkus Reviews verdict: GET IT

“A richly imagined mystery about a dead ornithologist in a beautiful mountainous California landscape.”

“O’Neal gives special attention to the natural world, a distinguishing feature from the traditional detective fiction fare.”

“A southern California mystery with an eye for the naturally beautiful and an ear for small town secrets.”

Independent Book Review

Direct from the Author

The Special Edition.

The Special Edition gift box of A Death on Halconido, open to show the signed hardcover, the Birds of Halconido life list, a Black Rosy-Finch field plate, and the gold Copley O’Neal seal.

Signed & embossed · assembled by hand

A Death on Halconido, boxed.

Special Edition Gift Box, A Death on Halconido. Each book is embossed with the Copley O’Neal seal and packed by hand. The gift box includes:

  • A signed premium hardcover, with the full-color Arts-and-Crafts cover illustration and matching dust jacket.
  • A handwritten postcard from one of the residents of Halconido — May Doddle? Chief Duro? Feel free to request your favorite mountain resident, and we’ll reach out and politely ask them to drop you or your gift recipient a postcard in the mail.
  • The Birds of Halconido field life list — all twenty-one species.
  • A Copley O’Neal bookmark, with a link to the discussion guide and other features at copleyoneal.com.
$65 Free shipping within the U.S.

Each box is made to order. Please allow a little time for signing and assembly before it ships.

News & Events

Where I'll be,
what's happening.

  • Jul 17–19, 2026
    Book Passage Mystery Writers Conference Corte Madera, California
    A weekend among friends and editors at one of the warmest gatherings on the calendar.
  • Aug 10, 2026
    A Death on Halconido — out now Available in hardcover, softcover, and ebook
    Publication day — the book is out now in hardcover, softcover, and ebook. An exclusive signed hardcover gift edition is also available. Click here to order.
  • Apr 1–4, 2027
    Left Coast Crime Santa Fe, New Mexico
    A first trip to Santa Fe for the annual gathering.

A Side Door

Ask the Detective.

Three questions only

Put a question to Detective Will Aguayo.

Will Aguayo, the sheriff turned detective from A Death on Halconido, will take three questions. Ask him about the mountain, his work, his abuelita, or whatever you're curious about. Because he is a professional, he likely won't discuss the specifics of any ongoing case. You'll need to read the book all the way through for that.

3 questions remaining

For the Birders

A field checklist.

Twenty-one species

Birds of Halconido.

Every bird that wings through A Death on Halconido, from the Acorn Woodpecker drilling its granary trees to Clark's Nutcracker caching pine seeds beneath the mountain snow, gathered into a vintage field-guide checklist. Print it, carry it into the oaks and chaparral, and mark off each species as you find it.

Indigo Bunting (Passerina cyanea), an illustrated plate from the Birds of Halconido field checklist
Open the checklist Printable PDF · 3 pages · US Letter

For Book Groups

A reader’s companion.

A conversation guide

Discussing A Death on Halconido.

A set of questions to carry into your book group. No right answers, only the promise that the conversation may invite even more questions.

Download the guide Printable PDF · 2 pages · US Letter

From Halconido Mountain

A postcard in the mail.

The back of a vintage postcard bearing a Halconido Mountain return address

Leave your address and one of Halconido Mountain’s residents — perhaps May Doddle of MayMart herself — will send you a handwritten postcard. A small thank-you for reading.

Contact

Get in touch.

For press, events, and reader correspondence.